add metric of skipped messages in pull-based ingestion processing

[yupeng9]

Description

• add metric of skipped messages in pull-based ingestion processing
• use record class for the PollingIngestStats

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[github-actions]

❌ Gradle check result for 69c8590: FAILURE

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[github-actions]

❌ Gradle check result for 69c8590: 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 5a4da4c: FAILURE

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[github-actions]

❌ Gradle check result for 5a4da4c: 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 5a4da4c: 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 5a4da4c: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 72.49%. Comparing base (471acef) to head (85d7518).
Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
...ndices/pollingingest/MessageProcessorRunnable.java	70.00%	3 Missing ⚠️
...rch/indices/pollingingest/DefaultStreamPoller.java	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #17938      +/-   ##
============================================
- Coverage     72.52%   72.49%   -0.04%     
+ Complexity    67031    66992      -39     
============================================
  Files          5470     5470              
  Lines        309707   309702       -5     
  Branches      45052    45046       -6     
============================================
- Hits         224617   224519      -98     
- Misses        66774    66822      +48     
- Partials      18316    18361      +45     

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[mch2]

lgtm

[github-actions]

❌ Gradle check result for 85d7518: 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 85d7518: 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 85d7518: SUCCESS