feat(state-keeper): Remove pre_insert_txs step

[perekopskiy]

What ❔

Removes pre_insert_txs l2 block seal step. Instead insert_txs flag should be passed to mark_txs_as_executed_in_l2_block.

Why ❔

Inserting txs with block data right away is faster then insert + updating block data.

Checklist

• PR title corresponds to the body of PR (we generate changelog entries from PRs).
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[RomanBrodetski]

@perekopskiy let's go for it! Or is there something that blocks this?

[perekopskiy]

@RomanBrodetski I'll have to rebase it against main if we want to merge it sooner than #1801. It requires some effort, let me check, maybe 1801 will be merged really soon

[github-actions]

No performance difference detected (anymore)