Add PacketBatch packet_indexes stat (backport #22564)

[mergify]

This is an automatic backport of pull request #22564 done by Mergify.
Cherry-pick of 6508822 has failed:

On branch mergify/bp/v1.8/pr-22564
Your branch is up to date with 'origin/v1.8'.

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Unmerged paths:
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	both modified:   core/src/banking_stage.rs

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[mergify]

automerge label removed due to a CI failure

[mergify]

automerge label removed due to a CI failure

[codecov]

Codecov Report

Merging #22574 (d738abe) into v1.8 (78b82de) will decrease coverage by 0.0%.
The diff coverage is 100.0%.

@@            Coverage Diff            @@
##             v1.8   #22574     +/-   ##
=========================================
- Coverage    81.6%    81.6%   -0.1%     
=========================================
  Files         460      460             
  Lines      131364   131374     +10     
=========================================
  Hits       107249   107249             
- Misses      24115    24125     +10     

[github-actions]

This PR has been automatically locked since there has not been any activity in past 14 days after it was merged.