Adds log4j configuration for telemetry-otel plugin (#8393)

[Gaganjuneja]

Backport to 2.x

Main PR - #8393
Main branch commit - 7a5c810

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/19226/
• CommitID: 07434cf
  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?

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/19231/
• CommitID: 4b55e3b
  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?

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❕
• TEST FAILURES:

      1 org.opensearch.remotestore.RemoteStoreRefreshListenerIT.testRemoteRefreshRetryOnFailure

• URL: https://build.ci.opensearch.org/job/gradle-check/19238/
• CommitID: 23dcbe4
  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]

Codecov Report

Merging #8468 (23dcbe4) into 2.x (68a4d36) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##                2.x    #8468      +/-   ##
============================================
- Coverage     70.65%   70.63%   -0.03%     
+ Complexity    57088    57076      -12     
============================================
  Files          4746     4746              
  Lines        270449   270451       +2     
  Branches      39931    39931              
============================================
- Hits         191078   191025      -53     
- Misses        62911    62999      +88     
+ Partials      16460    16427      -33     

Impacted Files	Coverage Δ
...search/telemetry/tracing/OTelResourceProvider.java	100.00% <100.00%> (ø)
.../org/opensearch/cluster/service/MasterService.java	85.06% <100.00%> (+1.60%)	⬆️
...ain/java/org/opensearch/threadpool/ThreadPool.java	84.01% <100.00%> (-0.54%)	⬇️

... and 453 files with indirect coverage changes