many: fix swapping back and forth between kernels with components during remodeling

[andrewphelpsj]

This is a new version of #15046, since that one was reverted (the nested suite didn't get a clean run). No new changes here, reviewing should be simple.

Once cutting the release is done, I'll remove the "Skip spread" tag.

[github-actions]

Wed Feb 26 20:45:28 UTC 2025

Spread tests skipped

[codecov]

Codecov Report

Attention: Patch coverage is 71.01449% with 20 lines in your changes missing coverage. Please review.

Project coverage is 78.07%. Comparing base (a272aac) to head (799ec55).
Report is 70 commits behind head on master.

Files with missing lines	Patch %	Lines
overlord/snapstate/snapstate.go	71.01%	13 Missing and 7 partials ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #15140    +/-   ##
========================================
  Coverage   78.07%   78.07%            
========================================
  Files        1182     1182            
  Lines      157743   158149   +406     
========================================
+ Hits       123154   123474   +320     
- Misses      26943    26994    +51     
- Partials     7646     7681    +35     

Flag	Coverage Δ
unittests	78.07% <71.01%> (+<0.01%)	⬆️

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