[fix][test] Fix flaky ManagedCursorTest.testSkipEntries

[merlimat]

Flaky test failure

java.lang.AssertionError: expected [7:1] but found [8:-1]
	at org.testng.Assert.fail(Assert.java:110)
	at org.testng.Assert.failNotEquals(Assert.java:1577)
	at org.testng.Assert.assertEqualsImpl(Assert.java:149)
	at org.testng.Assert.assertEquals(Assert.java:131)
	at org.testng.Assert.assertEquals(Assert.java:643)
	at org.apache.bookkeeper.mledger.impl.ManagedCursorTest.testSkipEntries(ManagedCursorTest.java:2136)

Summary

• Fix race condition in ManagedCursorTest.testSkipEntries where the assertion on mark-delete position fails because TrimConsumedLedgers asynchronously advances it beyond the expected value.
• Changed strict assertEquals to >= comparison since the mark-delete position can legitimately be advanced by the trim operation.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.72%. Comparing base (7f6bc23) to head (4d881d1).
⚠️ Report is 7 commits behind head on master.

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #25339       +/-   ##
=============================================
+ Coverage     37.45%   72.72%   +35.26%     
- Complexity    13161    33849    +20688     
=============================================
  Files          1897     1954       +57     
  Lines        150557   154745     +4188     
  Branches      17215    17709      +494     
=============================================
+ Hits          56398   112537    +56139     
+ Misses        86428    33172    -53256     
- Partials       7731     9036     +1305     

Flag	Coverage Δ
inttests	25.63% <ø> (-0.41%)	⬇️
systests	22.52% <ø> (+0.02%)	⬆️
unittests	73.69% <ø> (+39.51%)	⬆️

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see 1418 files with indirect coverage changes

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