Add as_u256 for U128 (#6951) #23439

Job	Run time
build-forc-test-project	3m 51s
build-forc-doc-sway-lib-std	1m 19s
build-mdbook	7m 42s
build-reference-examples	1m 9s
build-sway-examples	1m 6s
build-sway-lib-core	53s
build-sway-lib-std	1m 5s
cargo-build-workspace	3m 14s
cargo-clippy	1m 9s
cargo-fmt-check	13s
cargo-run-e2e-test-evm	6m 29s
cargo-test-lib-std	7m 47s
cargo-test-forc	1m 51s
cargo-test-sway-lsp	9m 39s
cargo-test-workspace	5m 43s
cargo-toml-fmt-check	14s
cargo-unused-deps-check	9m 40s
check-sdk-harness-test-suite-compatibility	32s
forc-fmt-check-panic	2m 18s
forc-fmt-check-sway-examples	41s
forc-fmt-check-sway-lib-core	1m 18s
forc-pkg-fuels-deps-check	17s
forc-fmt-check-sway-lib-std	49s
forc-run-benchmarks	2m 48s
forc-unit-tests	6m 19s
get-fuel-core-version	37s
pre-publish-check	0s
cargo-test-forc-client	3m 36s
cargo-test-forc-debug	3m 5s
cargo-run-e2e-test	14m 0s
cargo-run-e2e-test-release	17m 2s
cargo-test-forc-node	1m 17s
notify-slack-on-failure	1s
build-publish-master-image	5m 17s
publish	0s
Build and upload forc binaries to release	0s
build-publish-release-image	0s
verifications-complete	0s
	2h 3m 1s

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