migrate pallet-session-benchmarking to bench V2 syntax

[clangenb]

Migrates pallet-session-benchmarking to bench V2 syntax.

Part of:

• Refactor pallets to V2 bench syntax #6202

[clangenb]

This also failed on master.

---- mock::test_genesis_config_builds stdout ----
thread 'mock::test_genesis_config_builds' panicked at /home/clang/code/polkadot-sdk/substrate/frame/session/src/lib.rs:440:17:
Number of keys in session handler and session keys does not match
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

I was a bit surprised that cargo test -p pallet-session-benchmarking --features runtime-benchmarks failed on master, is this not CI tested?

[clangenb]

This failed on master:

---- mock::test_genesis_config_builds stdout ----
thread 'mock::test_genesis_config_builds' panicked at /home/clang/code/polkadot-sdk/substrate/frame/session/src/historical/mod.rs:93:15:
No name_hash found for the pallet in the runtime! This usually means that the pallet wasn't added to `construct_runtime!`.
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

[clangenb]

@re-gius review bump :)

[re-gius]

bot bench substrate-pallet --features=runtime-benchmarks --pallet=pallet_session_benchmarking

[command-bot]

@re-gius https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/7840163 was started for your command "$PIPELINE_SCRIPTS_DIR/commands/bench/bench.sh" --subcommand=pallet --runtime=dev --target_dir=substrate --features=runtime-benchmarks --pallet=pallet_session_benchmarking. Check out https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/pipelines?page=1&scope=all&username=group_605_bot to know what else is being executed currently.

Comment bot cancel 8-01264b37-3878-47e9-8f85-2327d26f25f8 to cancel this command or bot cancel to cancel all commands in this pull request.

[re-gius]

Run cargo +nightly fmt --all -- --check (see CI https://github.com/paritytech/polkadot-sdk/actions/runs/11596200437/job/32286844067?pr=6294 )

[command-bot]

@re-gius Command "$PIPELINE_SCRIPTS_DIR/commands/bench/bench.sh" --subcommand=pallet --runtime=dev --target_dir=substrate --features=runtime-benchmarks --pallet=pallet_session_benchmarking has finished. Result: https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/7840163 has finished. If any artifacts were generated, you can download them from https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/7840163/artifacts/download.

[re-gius]

bot bench substrate-pallet --features=runtime-benchmarks --pallet=pallet_session

[command-bot]

@re-gius https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/7841388 was started for your command "$PIPELINE_SCRIPTS_DIR/commands/bench/bench.sh" --subcommand=pallet --runtime=dev --target_dir=substrate --features=runtime-benchmarks --pallet=pallet_session. Check out https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/pipelines?page=1&scope=all&username=group_605_bot to know what else is being executed currently.

Comment bot cancel 10-c6294b99-da58-4a03-96e9-fe88dbc61a0b to cancel this command or bot cancel to cancel all commands in this pull request.

[command-bot]

@re-gius Command "$PIPELINE_SCRIPTS_DIR/commands/bench/bench.sh" --subcommand=pallet --runtime=dev --target_dir=substrate --features=runtime-benchmarks --pallet=pallet_session has finished. Result: https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/7841388 has finished. If any artifacts were generated, you can download them from https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/7841388/artifacts/download.