`pallet-transaction-storage` - revisit benchmarking

[bkontur]

TODO

• now:
  • fix now fn on_initialize manual weight guessing/metering and replace with benchmarked one
  • remove pallet_transaction_storage from bench_flags for kitchensink-runtime:

    polkadot-sdk/.github/workflows/runtimes-matrix.json

    Line 9 in 490aa7f

    "bench_flags": "--exclude-pallets=pallet_xcm,pallet_xcm_benchmarks::fungible,pallet_xcm_benchmarks::generic,pallet_nomination_pools,pallet_remark,pallet_transaction_storage",

    
    (bench bot: CI: https://github.com/paritytech/polkadot-sdk/actions/runs/19067876837/job/54462913030)
• later: (when pallet-transaction-storage merge to Polkadot-SDK's one polkadot-bulletin-chain#86)
  • revisit all the other extrinsics