Rename Packets to PacketBatch (backport #21794)

[mergify]

This is an automatic backport of pull request #21794 done by Mergify.
Cherry-pick of 254ef3e has failed:

On branch mergify/bp/v1.9/pr-21794
Your branch is up to date with 'origin/v1.9'.

You are currently cherry-picking commit 254ef3e7b.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   banking-bench/src/main.rs
	modified:   bench-streamer/src/main.rs
	modified:   core/benches/banking_stage.rs
	modified:   core/benches/sigverify_stage.rs
	modified:   core/src/ancestor_hashes_service.rs
	modified:   core/src/banking_stage.rs
	modified:   core/src/cluster_info_vote_listener.rs
	modified:   core/src/fetch_stage.rs
	modified:   core/src/retransmit_stage.rs
	modified:   core/src/serve_repair.rs
	modified:   core/src/shred_fetch_stage.rs
	modified:   core/src/sigverify.rs
	modified:   core/src/sigverify_shreds.rs
	modified:   core/src/sigverify_stage.rs
	modified:   core/src/window_service.rs
	modified:   entry/src/entry.rs
	modified:   gossip/src/cluster_info.rs
	modified:   ledger/benches/sigverify_shreds.rs
	modified:   ledger/src/sigverify_shreds.rs
	modified:   perf/benches/recycler.rs
	modified:   perf/benches/sigverify.rs
	modified:   perf/src/packet.rs
	modified:   perf/src/recycler.rs
	modified:   perf/src/sigverify.rs
	modified:   streamer/src/packet.rs
	modified:   streamer/src/streamer.rs

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   core/src/verified_vote_packets.rs

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[mergify]

automerge label removed due to a CI failure

[codecov]

Codecov Report

Merging #21805 (4dc3864) into v1.9 (87accd1) will decrease coverage by 0.3%.
The diff coverage is 70.0%.

@@            Coverage Diff            @@
##             v1.9   #21805     +/-   ##
=========================================
- Coverage    81.6%    81.3%   -0.4%     
=========================================
  Files         511      515      +4     
  Lines      143102   143598    +496     
=========================================
- Hits       116860   116803     -57     
- Misses      26242    26795    +553     

[github-actions]

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