fix: dropping child table rows during streaming replication

[levkk]

For partitioned tables, we were only streaming rows for the first child instead of all of them.

[codecov]

Codecov Report

❌ Patch coverage is 95.34884% with 4 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...c/backend/replication/logical/subscriber/stream.rs	91.30%	4 Missing ⚠️

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