removes CowCachedExecutors (backport #22343)

[mergify]

This is an automatic backport of pull request #22343 done by Mergify.
Cherry-pick of c2389fc has failed:

On branch mergify/bp/v1.8/pr-22343
Your branch is up to date with 'origin/v1.8'.

You are currently cherry-picking commit c2389fc20.
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  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
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	both modified:   runtime/src/bank.rs

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

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 #22362 (7c6e8e8) into v1.8 (b30c726) will decrease coverage by 0.0%.
The diff coverage is 100.0%.

@@            Coverage Diff            @@
##             v1.8   #22362     +/-   ##
=========================================
- Coverage    81.5%    81.5%   -0.1%     
=========================================
  Files         459      459             
  Lines      130991   130967     -24     
=========================================
- Hits       106868   106823     -45     
- Misses      24123    24144     +21     

[github-actions]

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