HBASE-30267 Backport HBASE-30266 Do not drop visibility delete marker…

[liuxiaocs7]

…s as redundant during minor compaction to branch-2

• see: HBASE-30267 and HBASE-30266

[Copilot]

Pull request overview

This PR backports the HBASE-30266 fix to branch-2 to ensure that, on cell-visibility tables, delete markers are not incorrectly treated as redundant during minor compaction (which could otherwise resurrect data that must remain deleted).

Changes:

• Override VisibilityScanDeleteTracker#isRedundantDelete to conservatively return false for all delete markers on visibility tables.
• Add a focused unit test to pin the “never redundant” contract for visibility delete tracking.
• Add an end-to-end regression test that exercises minor-compaction behavior to ensure differently-labeled delete markers are retained.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
hbase-server/src/main/java/org/apache/hadoop/hbase/security/visibility/VisibilityScanDeleteTracker.java	Forces isRedundantDelete to always return false to prevent label-blind redundancy pruning during minor compaction.
hbase-server/src/test/java/org/apache/hadoop/hbase/security/visibility/TestVisibilityScanDeleteTracker.java	Adds unit coverage asserting visibility delete markers are never reported redundant (including same-label and label-less cases).
hbase-server/src/test/java/org/apache/hadoop/hbase/security/visibility/TestVisibilityLabelsWithDeletes.java	Adds an end-to-end regression test ensuring differently-labeled delete markers survive minor compaction and prevent data resurrection.

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