refine warning msg when preloading segments not exist on server

[klsince]

When segment does not exist on the server before, the method to get validDocId snapshot file path throws exception. The current error log msg is too verbose. As the segment can be skipped upon this error, so changed to a concise warning log for this case.

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (f22de0a) 61.65% compared to head (fd94a82) 61.63%.

Files	Patch %	Lines
...t/local/upsert/BaseTableUpsertMetadataManager.java	75.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #12153      +/-   ##
============================================
- Coverage     61.65%   61.63%   -0.02%     
  Complexity     1152     1152              
============================================
  Files          2407     2407              
  Lines        130927   130930       +3     
  Branches      20224    20224              
============================================
- Hits          80718    80705      -13     
- Misses        44326    44336      +10     
- Partials       5883     5889       +6     

Flag	Coverage Δ
custom-integration1	<0.01% <0.00%> (ø)
integration	<0.01% <0.00%> (ø)
integration1	<0.01% <0.00%> (ø)
integration2	0.00% <0.00%> (ø)
java-11	61.59% <75.00%> (+<0.01%)	⬆️
java-21	61.49% <75.00%> (-0.04%)	⬇️
skip-bytebuffers-false	61.62% <75.00%> (-0.02%)	⬇️
skip-bytebuffers-true	61.47% <75.00%> (+<0.01%)	⬆️
temurin	61.63% <75.00%> (-0.02%)	⬇️
unittests	61.63% <75.00%> (-0.02%)	⬇️
unittests1	46.66% <0.00%> (-0.03%)	⬇️
unittests2	27.70% <75.00%> (+<0.01%)	⬆️

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