adds ShredId uniquely identifying each shred (backport #21820)

[mergify]

This is an automatic backport of pull request #21820 done by Mergify.
Cherry-pick of 4ceb268 has failed:

On branch mergify/bp/v1.9/pr-21820
Your branch is up to date with 'origin/v1.9'.

You are currently cherry-picking commit 4ceb2689f.
  (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:   core/src/retransmit_stage.rs
	modified:   core/src/window_service.rs
	modified:   ledger/src/shred.rs

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

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[mergify]

automerge label removed due to a CI failure

[codecov]

Codecov Report

Merging #21897 (5b883e7) into v1.9 (a9d4728) will decrease coverage by 0.0%.
The diff coverage is 95.3%.

@@            Coverage Diff            @@
##             v1.9   #21897     +/-   ##
=========================================
- Coverage    81.3%    81.3%   -0.1%     
=========================================
  Files         515      515             
  Lines      143700   143709      +9     
=========================================
  Hits       116845   116845             
- Misses      26855    26864      +9     

[github-actions]

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