[flink] Bugfix expire snapshot don't work when some snapshot between … #4744
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Purpose
When performing snapshot expiration, identify whether the maxExclusiveSnapshotID exists to prevent the expiration failing due to its absence. This ensures that the expired work can proceed, the earliest snapshot ID can be updated, and the issue of repetitive failure in the expiration process is avoided.
Linked issue: #4743
Tests
API and Format
Documentation