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

[ernestl]

Reverts #15046

After discussion with Andrew P, we decided to rather revert and create replacement PR that shows clean nested test run.
This content is not critical for the 2.68.2 release and it will therefore be excluded.

[andrewphelpsj]

Thanks!

[github-actions]

Wed Feb 26 20:25:49 UTC 2025

Spread tests skipped

[alfonsosanchezbeato]

Thank you

[codecov]

Codecov Report

Attention: Patch coverage is 90.76923% with 6 lines in your changes missing coverage. Please review.

Project coverage is 78.06%. Comparing base (a272aac) to head (7addbce).
Report is 70 commits behind head on master.

Files with missing lines	Patch %	Lines
overlord/snapstate/snapstate.go	90.76%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #15139      +/-   ##
==========================================
- Coverage   78.07%   78.06%   -0.01%     
==========================================
  Files        1182     1185       +3     
  Lines      157743   158244     +501     
==========================================
+ Hits       123154   123534     +380     
- Misses      26943    27029      +86     
- Partials     7646     7681      +35     

Flag	Coverage Δ
unittests	78.06% <90.76%> (-0.01%)	⬇️

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