Fix jdt formatter error

[nathaliellenaa]

Description

Fix jdt formatter error and refactor spotless configuration. Issue is due to the external eclipse umd mirror is down.

Following the same changes made in this PR: opensearch-project/OpenSearch#19199

Example of failing workflows:

• https://github.com/opensearch-project/ml-commons/actions/runs/17335599250/job/49221088170
• https://github.com/opensearch-project/ml-commons/actions/runs/17335599215/job/49221088122

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

Check List

• New functionality includes testing.
• New functionality has been documented.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff.
• Public documentation issue/PR created.

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[dhrubo-os]

@nathaliellenaa thanks for your bias for action!! This should solve the issue. From here looks like in every module spotless has the same configuration. Can you please check if we can remove all these and add the spotless configuration in the common build.gradle like here: https://github.com/opensearch-project/ml-commons/blob/main/build.gradle

This way we won't need to change in multiple places in future.

[nathaliellenaa]

From here looks like in every module spotless has the same configuration. Can you please check if we can remove all these and add the spotless configuration in the common build.gradle like here: https://github.com/opensearch-project/ml-commons/blob/main/build.gradle

@dhrubo-os I refactored the spotless configuration into a single common build.gradle file. This change introduced spotless checks to the SPI module (which previously didn't have one), resulting in formatting changes to the files in that module.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.81%. Comparing base (d077f31) to head (815891b).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4151      +/-   ##
============================================
- Coverage     81.82%   81.81%   -0.01%     
- Complexity     8849     8867      +18     
============================================
  Files           761      762       +1     
  Lines         38114    38167      +53     
  Branches       4251     4264      +13     
============================================
+ Hits          31185    31227      +42     
- Misses         5109     5113       +4     
- Partials       1820     1827       +7     

Flag	Coverage Δ
ml-commons	81.81% <ø> (-0.01%)	⬇️

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