Don't stop to find newer cluster-confirmed roots (bp #14557)

[mergify]

This is an automated backport of pull request #14557 done by Mergify

Cherry-pick of e95ebcf has failed:

On branch mergify/bp/v1.4/pr-14557
Your branch is up to date with 'origin/v1.4'.

You are currently cherry-picking commit e95ebcf86.
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Unmerged paths:
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	both modified:   ledger/src/blockstore_processor.rs

no changes added to commit (use "git add" and/or "git commit -a")

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[mergify]

automerge label removed due to a CI failure

[codecov]

Codecov Report

Merging #14559 (bec236f) into v1.4 (3d75623) will increase coverage by 0.0%.
The diff coverage is 100.0%.

@@          Coverage Diff           @@
##            v1.4   #14559   +/-   ##
======================================
  Coverage   82.5%    82.6%           
======================================
  Files        387      387           
  Lines      99437    99460   +23     
======================================
+ Hits       82134    82179   +45     
+ Misses     17303    17281   -22