[FLUSS-1873][server] Added Retry Handler to Address Snapshotting Test Asynchrony

[rionmonster]

Purpose

Linked issue: close #1873

Per Issue #1873, this pull request addresses a race condition that could sometimes occur and result in the ReplicaTest.testBrokenSnapshotRecovery test case failing (particularly during CI builds).

Brief change log

This change introduces a static triggerSnapshotTaskWithRetry helper function which wraps the existing scheduledExecutorService instance and issues the trigger functions within a retry loop and minor delay to help improve reliability. The previous explicit scheduledExecutorService.triggerNonPeriodicScheduledTask() calls have been replaced with this new function in the affected test case.

Tests

The ReplicaTest.testBrokenSnapshotRecovery was initially updated to use an iterative approach (e.g., repeat 50 times) as mentioned in the original issue to reproduce the issue. After this was repeatably reproducible, the proposed retry-helper was introduced to verify the test would repeatedly pass through all of the iterations.

The only change to the test were the previous replacement of the explicit triggerNonPeriodicScheduledTask() calls with the newly added wrapper.

API and Format

N/A

Documentation

N/A