v1.17: cpi: direct_mapping: always zero spare capacity if account alloc changes (backport of #34141)

[mergify]

This is an automatic backport of pull request #34141 done by Mergify.
Cherry-pick of d9147d7 has failed:

On branch mergify/bp/v1.17/pr-34141
Your branch is up to date with 'origin/v1.17'.

You are currently cherry-picking commit d9147d7a77.
  (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:   programs/sbf/rust/invoke/src/processor.rs

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   programs/bpf_loader/src/syscalls/cpi.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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[codecov]

Codecov Report

Merging #34177 (391a6ce) into v1.17 (67bfb48) will decrease coverage by 0.1%.
The diff coverage is 84.3%.

Additional details and impacted files

@@            Coverage Diff            @@
##            v1.17   #34177     +/-   ##
=========================================
- Coverage    81.8%    81.8%   -0.1%     
=========================================
  Files         803      803             
  Lines      218020   218020             
=========================================
- Hits       178479   178463     -16     
- Misses      39541    39557     +16