🌱 BundleDeployment Cleanup

[dtfranz]

Fixes: #998
Cleans up some of the baggage that came with the BundleDeployment API from rukpak.

Changes:

• Rename BundleDeployment -> BundleSource
• Remove unneeded DeepCopy generated funcs
• Remove more unused fields and consts
• Move BundleSource type into Unpacker pkg

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[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 15 lines in your changes missing coverage. Please review.

Project coverage is 72.85%. Comparing base (6cd022e) to head (0a8cf9e).
Report is 6 commits behind head on main.

Files	Patch %	Lines
internal/rukpak/source/unpacker.go	0.00%	9 Missing ⚠️
internal/rukpak/source/image_registry.go	60.00%	2 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1061      +/-   ##
==========================================
+ Coverage   72.50%   72.85%   +0.34%     
==========================================
  Files          32       31       -1     
  Lines        1884     1864      -20     
==========================================
- Hits         1366     1358       -8     
+ Misses        383      371      -12     
  Partials      135      135              

Flag	Coverage Δ
e2e	55.51% <50.00%> (+0.17%)	⬆️
unit	45.01% <20.00%> (+0.05%)	⬆️

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[tmshort]

/lgtm