[Backport 2.x] Adding allowlist setting for ingest-useragent and ingest-geoip processors

[saratvemulapalli]

Backport to 2.x: #15325
Adding allowlist setting for user-agent, geo-ip.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[github-actions]

❌ Gradle check result for 2250088: 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 ef0b862: 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 ee12522: 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 f0fde0a: 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?

[saratvemulapalli]

Tests with failures:

• org.opensearch.cluster.MinimumClusterManagerNodesIT.testThreeNodesNoClusterManagerBlock
• org.opensearch.remotestore.RemoteIndexRecoveryIT.testRerouteRecovery

[github-actions]

❌ Gradle check result for f0fde0a: 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?

[saratvemulapalli]

• What went wrong:
  Execution failed for task ':plugins:discovery-ec2:qa:amazon-ec2:yamlRestTestEnvVariables'.
  process was found dead while waiting for ports files, node{:plugins:discovery-ec2:qa:amazon-ec2:yamlRestTestEnvVariables-0}

:/

[github-actions]

✅ Gradle check result for f0fde0a: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 97.43590% with 1 line in your changes missing coverage. Please review.

Project coverage is 71.62%. Comparing base (cfd427a) to head (f0fde0a).
Report is 4 commits behind head on 2.x.

Files	Patch %	Lines
...org/opensearch/ingest/geoip/IngestGeoIpPlugin.java	95.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #15374      +/-   ##
============================================
+ Coverage     71.59%   71.62%   +0.03%     
- Complexity    63108    63156      +48     
============================================
  Files          5173     5173              
  Lines        296034   296070      +36     
  Branches      43114    43116       +2     
============================================
+ Hits         211931   212074     +143     
+ Misses        66334    66231     -103     
+ Partials      17769    17765       -4     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.