A documentation issue, used CONTRIBUTING.md instead of DEVELOPER_GUIDE.md

[akolarkunnu]

Description:
Replaced CONTRIBUTING.md with DEVELOPER_GUIDE.md

Resolves #13984

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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[github-actions]

❌ Gradle check result for 252c3e6: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[akolarkunnu]

Known flaky org.opensearch.indices.IndicesRequestCacheIT.testDeleteAndCreateSameIndexShardOnSameNode {p0={"opensearch.experimental.feature.pluggable.caching.enabled":"false"}} - #13792
Known flaky org.opensearch.indices.IndicesRequestCacheIT.testDeleteAndCreateSameIndexShardOnSameNode {p0={"search.concurrent_segment_search.enabled":"false"}} - #13600
Known flaky org.opensearch.indices.IndicesRequestCacheIT.testDeleteAndCreateSameIndexShardOnSameNode {p0={"search.concurrent_segment_search.enabled":"true"}} - #13600
Known flaky org.opensearch.indices.IndicesRequestCacheIT.testDeleteAndCreateSameIndexShardOnSameNode {p0={"opensearch.experimental.feature.pluggable.caching.enabled":"true"}} - #13792

[akolarkunnu]

Can anyone help me to rerun the test suite which is failed ?
Also please add label "skip-changelog", since it's just a documentation change.

[reta]

Thank you @akolarkunnu !

[github-actions]

✅ Gradle check result for 252c3e6: SUCCESS

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.71%. Comparing base (b15cb0c) to head (252c3e6).
Report is 354 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #14028      +/-   ##
============================================
+ Coverage     71.42%   71.71%   +0.29%     
- Complexity    59978    61443    +1465     
============================================
  Files          4985     5071      +86     
  Lines        282275   288403    +6128     
  Branches      40946    41764     +818     
============================================
+ Hits         201603   206827    +5224     
- Misses        63999    64531     +532     
- Partials      16673    17045     +372     

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