Tree view for files in package update dialog

[nl0]

TODO

• Unit tests (probably in a follow-up PR)
• Changelog entry

[codecov-io]

Codecov Report

Merging #1989 (23aa207) into master (05603fe) will decrease coverage by 0.27%.
The diff coverage is 2.17%.

@@            Coverage Diff             @@
##           master    #1989      +/-   ##
==========================================
- Coverage   47.07%   46.80%   -0.28%     
==========================================
  Files         332      332              
  Lines       16330    16418      +88     
  Branches     2197     2186      -11     
==========================================
- Hits         7688     7684       -4     
- Misses       7752     7837      +85     
- Partials      890      897       +7     

Flag	Coverage Δ
api-python	89.35% <ø> (ø)
catalog	7.41% <2.17%> (-0.13%)	⬇️
lambda	92.40% <ø> (ø)

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Impacted Files	Coverage Δ
...talog/app/containers/Bucket/PackageUpdateDialog.js	0.00% <0.00%> (ø)
catalog/app/utils/tagged.js	78.72% <75.00%> (-1.67%)	⬇️

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[fiskus]

Didn't find any bugs with shallow testing. I'm going to test it more tomorrow (maybe on staging?).
The left sidebar is weird, otherwise, UX is good and predictable.

[nl0]

• less saturated colors
• icon overlays (+/-/~)
• "revert" icon -> "undo" icon