fix(snapshot-backfill): fix incorrect recv barrier and add test for recover

[wenym1]

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What's changed and what's your intention?

Previously after snapshot backfill finishes and when the executor is recreated in recovery, we incorrectly do a recv_next_barrier, which will cause the recover to be stuck forever.

In this PR, we fix this bug and add test for the case of recovery.

Checklist

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[wenym1]

• feat(snapshot): persist snapshot backfill epoch in fragment stream node #19751
• fix(snapshot-backfill): fix incorrect recv barrier and add test for recover #19756 👈 (View in Graphite)
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[hzxa21]

Good catch