chore(en): Add sepolia en config (#663)

## What ❔

- marks goerli testnet EN config as deprecated
- adds sepolia testnet EN config
- removes `EN_BOOTLOADER_HASH`, `EN_DEFAULT_AA_HASH` from configs as
these vars are not used anymore

## Why ❔

Prepare docs for sepolia testnet EN launch

## Checklist

<!-- Check your PR fulfills the following items. -->
<!-- For draft PRs check the boxes as you complete them. -->

- [x] PR title corresponds to the body of PR (we generate changelog
entries from PRs).
- [x] Tests for the changes have been added / updated.
- [x] Documentation comments have been added / updated.
- [x] Code has been formatted via `zk fmt` and `zk lint`.
- [x] Spellcheck has been run via `cargo spellcheck
--cfg=./spellcheck/era.cfg --code 1`.

docs/guides/external-node/02_configuration.md

@@ -2,8 +2,8 @@
 
 This document outlines various configuration options for the EN. Currently, the EN requires the definition of numerous
 environment variables. To streamline this process, we provide prepared configs for the zkSync Era - for both
-[mainnet](prepared_configs/mainnet-config.env) and [testnet](prepared_configs/testnet-config.env). You can use these
-files as a starting point and modify only the necessary sections.
+[mainnet](prepared_configs/mainnet-config.env) and [testnet](prepared_configs/testnet-sepolia-config.env). You can use
+these files as a starting point and modify only the necessary sections.
 
 ## Database
 
@@ -20,7 +20,7 @@ recommended to use an NVME SSD for RocksDB. RocksDB requires two variables to be
 ## L1 Web3 client
 
 EN requires a connection to an Ethereum node. The corresponding env variable is `EN_ETH_CLIENT_URL`. Make sure to set
-the URL corresponding to the correct L1 network (L1 mainnet for L2 mainnet and L1 goerli for L2 testnet).
+the URL corresponding to the correct L1 network (L1 mainnet for L2 mainnet and L1 sepolia for L2 testnet).
 
 Note: Currently, the EN makes 2 requests to the L1 per L1 batch, so the Web3 client usage for a synced node should not
 be high. However, during the synchronization phase the new batches would be persisted on the EN quickly, so make sure

docs/guides/external-node/prepared_configs/mainnet-config.env

@@ -83,9 +83,6 @@ EN_MAIN_NODE_URL=https://zksync2-mainnet.zksync.io
 EN_L2_CHAIN_ID=324
 EN_L1_CHAIN_ID=1
 
-EN_BOOTLOADER_HASH=0x010007794e73f682ad6d27e86b6f71bbee875fc26f5708d1713e7cfd476098d3
-EN_DEFAULT_AA_HASH=0x0100067d861e2f5717a12c3e869cfb657793b86bbb0caa05cc1421f16c5217bc
-
 # Optional, required only if sentry is configured. 
 EN_SENTRY_ENVIRONMENT=zksync_mainnet
 

docs/guides/external-node/prepared_configs/testnet-config.env → docs/guides/external-node/prepared_configs/testnet-goerli-config-deprecated.env

@@ -83,9 +83,6 @@ EN_MAIN_NODE_URL=https://zksync2-testnet.zksync.dev
 EN_L2_CHAIN_ID=280
 EN_L1_CHAIN_ID=5
 
-EN_BOOTLOADER_HASH=0x010007794e73f682ad6d27e86b6f71bbee875fc26f5708d1713e7cfd476098d3
-EN_DEFAULT_AA_HASH=0x0100067d861e2f5717a12c3e869cfb657793b86bbb0caa05cc1421f16c5217bc
-
 # Optional, required only if sentry is configured. 
 EN_SENTRY_ENVIRONMENT=zksync_testnet
 

docs/guides/external-node/prepared_configs/testnet-sepolia-config.env

@@ -0,0 +1,94 @@
+# ------------------------------------------------------------------------
+# -------------- YOU MUST CHANGE THE FOLLOWING VARIABLES -----------------
+# ------------------------------------------------------------------------
+
+# URL of the Postgres DB.
+DATABASE_URL=postgres://postgres@localhost/zksync_local_ext_node
+# PostgreSQL connection pool size
+DATABASE_POOL_SIZE=50
+
+# Folder where the state_keeper cache will be stored (RocksDB).
+# If containerized, this path should be mounted to a volume.
+EN_STATE_CACHE_PATH=./db/ext-node/state_keeper
+# Folder where the Merkle Tree will be stored (RocksDB).
+# If containerized, this path should be mounted to a volume.
+EN_MERKLE_TREE_PATH=./db/ext-node/lightweight
+
+# URL of the Ethereum client (e.g. infura / alchemy).
+EN_ETH_CLIENT_URL=http://127.0.0.1:8545
+
+# ------------------------------------------------------------------------
+# -------------- YOU MAY CONFIGURE THE FOLLOWING VARIABLES ---------------
+# ------------------------------------------------------------------------
+
+# Port on which to serve the HTTP JSONRPC API.
+EN_HTTP_PORT=3060
+# Port on which to serve the WebSocket JSONRPC API.
+EN_WS_PORT=3061
+
+# Port on which to serve metrics to be collected by Prometheus.
+# If not set, metrics won't be collected.
+# EN_PROMETHEUS_PORT=3322
+
+# Port on which to serve the healthcheck endpoint (to check if the service is live).
+EN_HEALTHCHECK_PORT=3081
+
+# Max possible limit of entities to be requested at once.
+EN_REQ_ENTITIES_LIMIT=10000
+# Max possible limit of filters to be active at once.
+EN_FILTERS_LIMIT=10000
+# Max possible limit of subscriptions to be active at once.
+EN_SUBSCRIPTIONS_LIMIT=10000
+# Interval for polling the DB for pubsub (in ms).
+EN_PUBSUB_POLLING_INTERVAL=200
+# Number of threads per API server.
+EN_THREADS_PER_SERVER=128
+# Tx nonce: how far ahead from the committed nonce can it be.
+# This shouldn't be larger than the value on the main node (50).
+EN_MAX_NONCE_AHEAD=50
+# The multiplier to use when suggesting gas price. Should be higher than one,
+# otherwise if the L1 prices soar, the suggested gas price won't be sufficient to be included in block.
+EN_GAS_PRICE_SCALE_FACTOR=1.2
+# The factor by which to scale the gasLimit
+EN_ESTIMATE_GAS_SCALE_FACTOR=1.2
+# The max possible number of gas that `eth_estimateGas` is allowed to overestimate.
+EN_ESTIMATE_GAS_ACCEPTABLE_OVERESTIMATION=1000
+# Max possible size of an ABI encoded tx (in bytes).
+# This shouldn't be larger than the value on the main node.
+EN_MAX_TX_SIZE=1000000
+# Enabled JSON-RPC API namespaces. Also available: en, debug.
+EN_API_NAMESPACES=eth,net,web3,zks,pubsub
+
+# Settings related to sentry and opentelemetry.
+MISC_LOG_FORMAT=plain
+MISC_SENTRY_URL=unset
+MISC_SENTRY_PANIC_INTERVAL=1800
+MISC_SENTRY_ERROR_INTERVAL=10800
+MISC_OTLP_URL=unset
+
+# Settings related to Rust logging and backtraces.
+# You can read about the format [here](https://docs.rs/env_logger/0.10.0/env_logger/#enabling-logging) to fine-tune logging.
+RUST_LOG=zksync_core=debug,zksync_dal=info,zksync_eth_client=info,zksync_merkle_tree=info,zksync_storage=info,zksync_state=debug,zksync_types=info,vm=info,zksync_external_node=info,zksync_utils=debug,
+RUST_BACKTRACE=full
+RUST_LIB_BACKTRACE=1
+
+
+# ------------------------------------------------------------------------
+# -------------- THE FOLLOWING VARIABLES DEPEND ON THE ENV ---------------
+# ------------------------------------------------------------------------
+
+# URL of the main zkSync node.
+EN_MAIN_NODE_URL=https://sepolia.era.zksync.dev
+
+EN_L2_CHAIN_ID=300
+EN_L1_CHAIN_ID=11155111
+
+# Optional, required only if sentry is configured. 
+EN_SENTRY_ENVIRONMENT=zksync_testnet
+
+# ------------------------------------------------------------------------
+# -------------- THE FOLLOWING VARIABLES ARE NOT USED --------------------
+# -------------- BUT HAVE TO BE SET. JUST LEAVE THEM AS IS ---------------
+# ------------------------------------------------------------------------
+
+ZKSYNC_HOME=/