[Remote State] Disable remote publication if remote state disabled

[shiv0408]

Description

Fall back to legacy Transport publication if Remote State is disabled. We were earlier trying to use remote publication when remote state was disabled, as the remote state was disabled RemoteClusterStateService instance is null and we were hitting null pointer.

Related Issues

Resolves #15182

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 c240d50: 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?

[github-actions]

✅ Gradle check result for f23b757: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 71.87%. Comparing base (f94a99e) to head (a6e78ed).
Report is 16 commits behind head on main.

Files	Patch %	Lines
...search/cluster/coordination/CoordinationState.java	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               main   #15219    +/-   ##
==========================================
  Coverage     71.86%   71.87%            
+ Complexity    63227    63168    -59     
==========================================
  Files          5213     5213            
  Lines        295780   295781     +1     
  Branches      42725    42726     +1     
==========================================
+ Hits         212568   212598    +30     
+ Misses        65842    65724   -118     
- Partials      17370    17459    +89     

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[github-actions]

❌ Gradle check result for 9ab68d7: FAILURE

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[github-actions]

❌ Gradle check result for 9b47d5b: FAILURE

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[github-actions]

❌ Gradle check result for a6e78ed: 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?

[shiv0408]

❌ Gradle check result for a6e78ed: FAILURE

Test is flaky
org.opensearch.cluster.service.MasterServiceTests.testClusterStateUpdateLoggingWithDebugEnabled - #15117

[github-actions]

❕ Gradle check result for a6e78ed: UNSTABLE

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.