Prevent pruning IstioRevisions with unknown InUse status

[sridhargaddam]

Currently, the pruning logic would delete IstioRevisions when their InUse condition status was ConditionUnknown. This could occur when there are any transient API server errors while listing pods/namespaces. This fix implements a fail-safe approach by pruning only revisions that are explicitly confirmed to be not in use (Status == ConditionFalse). Revisions with ConditionTrue (inUse) or ConditionUnknown are now preserved, preventing accidental deletion of active control planes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.66%. Comparing base (a97fea6) to head (9509928).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1322      +/-   ##
==========================================
- Coverage   78.69%   78.66%   -0.03%     
==========================================
  Files          44       44              
  Lines        2253     2255       +2     
==========================================
+ Hits         1773     1774       +1     
  Misses        371      371              
- Partials      109      110       +1     

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[dgn]

Good catch, thank you @sridhargaddam!