fix(flink): Don't perform table service during mdt initialization if …

[cshuo]

…streaming write is enabled

Describe the issue this Pull Request addresses

HoodieFlinkTableServiceClient#initMetadataTable() always ran performTableServices, even when metadata streaming write was enabled. In streaming mode, this should be skipped. fixes #18284

Summary and Changelog

• Added a guard in initMetadataTable():
  • Run metadataWriter.performTableServices(...) only when hoodie.metadata.streaming.write.enabled=false.
• Added a parameterized test to cover both streaming modes and verify invocation behavior.

Impact

• Fixes incorrect metadata table service triggering in Flink streaming metadata mode.

Risk Level

low

Documentation Update

Contributor's checklist

• Read through contributor's guide
• Enough context is provided in the sections above
• Adequate tests were added if applicable

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.24%. Comparing base (3dcf4c6) to head (919d803).

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #18283      +/-   ##
============================================
+ Coverage     57.22%   57.24%   +0.01%     
+ Complexity    18607    18599       -8     
============================================
  Files          1951     1951              
  Lines        106765   106765              
  Branches      13198    13200       +2     
============================================
+ Hits          61099    61115      +16     
+ Misses        39901    39889      -12     
+ Partials       5765     5761       -4     

Flag	Coverage Δ
hadoop-mr-java-client	45.24% <ø> (+<0.01%)	⬆️
spark-java-tests	47.41% <ø> (+0.04%)	⬆️
spark-scala-tests	45.51% <ø> (-0.01%)	⬇️

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see 5 files with indirect coverage changes

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[hudi-bot]

CI report:

• 919d803 Azure: SUCCESS

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