[Backport 2.x] Removed linelint and check EOL using spotless

[opensearch-trigger-bot]

Backport dd6daab from #6657.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❕
• TEST FAILURES:

      1 org.opensearch.backwards.MixedClusterClientYamlTestSuiteIT.test {p0=pit/10_basic/Delete all}

• URL: https://build.ci.opensearch.org/job/gradle-check/12425/
• CommitID: 39cebc8
  Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[codecov-commenter]

Codecov Report

Merging #6667 (39cebc8) into 2.x (c362ab4) will decrease coverage by 0.07%.
The diff coverage is n/a.

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@@             Coverage Diff              @@
##                2.x    #6667      +/-   ##
============================================
- Coverage     70.47%   70.40%   -0.07%     
+ Complexity    59381    59316      -65     
============================================
  Files          4799     4799              
  Lines        285004   285004              
  Branches      41436    41436              
============================================
- Hits         200862   200665     -197     
- Misses        67355    67504     +149     
- Partials      16787    16835      +48     

see 499 files with indirect coverage changes

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