fix: table LSN not preserved during copy -> replication handover

[levkk]

• fix: regression introduced in fix: omnisharded resharding copy and replication #869 erasing table LSNs during copy to replication handover, causing rows written between slot creation and copy start replayed on the destination
• fix: off-by-one in replication to copy LSN check
• fix: advancing LSN prior to transaction commit, potentially skipping rows in the same transaction

[codecov]

Codecov Report

❌ Patch coverage is 91.01124% with 16 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...nd/replication/logical/publisher/publisher_impl.rs	82.08%	12 Missing ⚠️
...c/backend/replication/logical/subscriber/stream.rs	93.75%	3 Missing ⚠️
...rc/backend/replication/logical/subscriber/tests.rs	98.41%	1 Missing ⚠️

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