Add API to update segment ZK metadata without uploading

[goutamadwant]

Closes #10458

What this PR does

• Adds a dedicated PUT /segments/{tableNameWithType}/{segmentName}/metadata API for updating the segment ZK metadata custom map.
• Validates the expected segment CRC through If-Match and uses the ZK record version for compare-and-set protection.
• Routes unchanged single-segment conversions through the metadata-only API, avoiding segment compression and upload.
• Falls back to the existing refresh-only upload path when a mixed-version controller does not expose the new endpoint.

Backward compatibility

The endpoint is additive. Existing upload behavior is unchanged for modified segments, and older controllers continue to work through the fallback path.

Tests

• PinotSegmentRestletResourceTest
• BaseSingleSegmentConversionExecutorTest
• Pinot pre-commit checks for pinot-common, pinot-controller, and pinot-minion-builtin-tasks

[codecov-commenter]

Codecov Report

❌ Patch coverage is 47.69231% with 34 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.64%. Comparing base (d3604a5) to head (090e039).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...ot/plugin/minion/tasks/SegmentConversionUtils.java	0.00%	10 Missing ⚠️
...ler/api/resources/PinotSegmentRestletResource.java	68.96%	6 Missing and 3 partials ⚠️
...ion/tasks/BaseSingleSegmentConversionExecutor.java	57.89%	7 Missing and 1 partial ⚠️
...e/pinot/common/utils/FileUploadDownloadClient.java	0.00%	7 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #19180      +/-   ##
============================================
+ Coverage     66.62%   66.64%   +0.01%     
- Complexity     1423     1425       +2     
============================================
  Files          3443     3443              
  Lines        218577   218636      +59     
  Branches      34792    34798       +6     
============================================
+ Hits         145624   145703      +79     
+ Misses        61218    61197      -21     
- Partials      11735    11736       +1     

Flag	Coverage Δ
custom-integration1	100.00% <ø> (ø)
integration	100.00% <ø> (ø)
integration1	100.00% <ø> (ø)
integration2	0.00% <ø> (ø)
java-25	66.64% <47.69%> (+0.01%)	⬆️
temurin	66.64% <47.69%> (+0.01%)	⬆️
unittests	66.63% <47.69%> (+0.01%)	⬆️
unittests1	57.14% <0.00%> (+0.01%)	⬆️
unittests2	38.94% <47.69%> (+0.01%)	⬆️

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[Jackie-Jiang]

cc @swaminathanmanish @krishan1390 @KKcorps @noob-se7en