v1.16: Support a custom path for the accounts hash cache (backport of #33115)

[mergify]

This is an automatic backport of pull request #33115 done by Mergify.
Cherry-pick of d1b8499 has failed:

On branch mergify/bp/v1.16/pr-33115
Your branch is up to date with 'origin/v1.16'.

You are currently cherry-picking commit d1b849972f.
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Unmerged paths:
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	both modified:   runtime/src/accounts_db.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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[codecov]

Codecov Report

Merging #33120 (c976676) into v1.16 (015e7c5) will increase coverage by 0.0%.
The diff coverage is n/a.

❗ Current head c976676 differs from pull request most recent head 4d11c94. Consider uploading reports for the commit 4d11c94 to get more accurate results

@@           Coverage Diff            @@
##            v1.16   #33120    +/-   ##
========================================
  Coverage    81.9%    81.9%            
========================================
  Files         762      762            
  Lines      207825   208129   +304     
========================================
+ Hits       170341   170634   +293     
- Misses      37484    37495    +11     

[brooksprumo]

lgtm

[brooksprumo]

(can I approve my own backport?)

[CriesofCarrots]

(can I approve my own backport?)

[t-nelson]

(can I approve my own backport?)

backports are "mergify's" 😉