Add s3 files from selected buckets

[nl0]

Description

TODO

• Unit tests
• Automated tests (e.g. Preflight)
• Documentation
  • Python: Run build.py for new docstrings
  • JavaScript: basic explanation and screenshot of new features
• Changelog entry

[codecov]

Codecov Report

Merging #2193 (a79fe6d) into master (92929cb) will decrease coverage by 0.06%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #2193      +/-   ##
==========================================
- Coverage   46.32%   46.26%   -0.07%     
==========================================
  Files         446      446              
  Lines       22173    22203      +30     
  Branches     2685     2692       +7     
==========================================
  Hits        10272    10272              
- Misses      10989    11019      +30     
  Partials      912      912              

Flag	Coverage Δ
api-python	89.85% <ø> (ø)
catalog	15.47% <0.00%> (-0.04%)	⬇️
lambda	94.00% <ø> (ø)

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Impacted Files	Coverage Δ
...app/containers/Bucket/PackageDialog/FilesInput.tsx	0.00% <0.00%> (ø)
...p/containers/Bucket/PackageDialog/S3FilePicker.tsx	0.00% <0.00%> (ø)
...alog/app/containers/Bucket/PackageUpdateDialog.tsx	0.00% <0.00%> (ø)
catalog/app/utils/BucketPreferences.tsx	0.00% <0.00%> (ø)

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[nl0]

@sir-sigurd not sure while lambda tests are failing here -- i didnt touch any related code