Remove unused fields from Bank (backport #22491)

[mergify]

This is an automatic backport of pull request #22491 done by Mergify.
Cherry-pick of 9977396 has failed:

On branch mergify/bp/v1.9/pr-22491
Your branch is up to date with 'origin/v1.9'.

You are currently cherry-picking commit 9977396d8.
  (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:   runtime/src/bank.rs

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   runtime/src/serde_snapshot/future.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 #22630 (6233cd2) into v1.9 (2ddb5b2) will increase coverage by 0.0%.
The diff coverage is 100.0%.

@@           Coverage Diff           @@
##             v1.9   #22630   +/-   ##
=======================================
  Coverage    81.1%    81.2%           
=======================================
  Files         527      527           
  Lines      146519   146502   -17     
=======================================
+ Hits       118958   118995   +37     
+ Misses      27561    27507   -54     

[github-actions]

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