Improve HelmRelease dependency tracking for diffs

[allenporter]

Improve HelmRelease dependency tracking for diffs by tracking changes in dependencies like ConfigMaps and HelmReleases.

Fixes #817

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 97.01493% with 2 lines in your changes missing coverage. Please review.

Project coverage is 93.77%. Comparing base (83ae11e) to head (9698b6a).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
flux_local/kustomize.py	50.00%	1 Missing ⚠️
flux_local/manifest.py	96.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #821      +/-   ##
==========================================
+ Coverage   93.57%   93.77%   +0.20%     
==========================================
  Files          21       21              
  Lines        2257     2314      +57     
==========================================
+ Hits         2112     2170      +58     
+ Misses        145      144       -1     

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