Remove block attestation

As of commit 1325059f136198fd72c7d7ca3c5da762078d110a in hyperledger/fabric, the "BlockAttestation" object is no longer used.

Signed-off-by: Yoav Tock <tock@il.ibm.com>

buf.yaml

@@ -50,7 +50,6 @@ lint:
     ONEOF_LOWER_SNAKE_CASE:
       - common/policies.proto
       - orderer/ab.proto
-      - orderer/blockattestation.proto
       - peer/events.proto
       - peer/lifecycle/db.proto
       - peer/lifecycle/lifecycle.proto
@@ -99,7 +98,6 @@ lint:
     RPC_REQUEST_RESPONSE_UNIQUE:
       - gossip/message.proto
       - orderer/ab.proto
-      - orderer/blockattestation.proto
       - peer/chaincode_shim.proto
       - peer/events.proto
       - peer/snapshot.proto
@@ -108,15 +106,13 @@ lint:
       - gateway/gateway.proto
       - gossip/message.proto
       - orderer/ab.proto
-      - orderer/blockattestation.proto
       - peer/chaincode_shim.proto
       - peer/events.proto
       - peer/peer.proto
       - peer/snapshot.proto
     RPC_RESPONSE_STANDARD_NAME:
       - discovery/protocol.proto
       - gossip/message.proto
-      - orderer/blockattestation.proto
       - peer/chaincode_shim.proto
       - peer/events.proto
       - peer/peer.proto
@@ -126,7 +122,6 @@ lint:
       - gateway/gateway.proto
       - gossip/message.proto
       - orderer/ab.proto
-      - orderer/blockattestation.proto
       - orderer/cluster.proto
       - peer/chaincode_shim.proto
       - peer/events.proto