Validation of package entries metadata

[sir-sigurd]

Description

TODO

• Unit tests
• Documentation (added in Object-level validation, frontend #3336)
• Changelog entry (skip if change is not significant to end users, e.g. docs only)

[codecov]

Codecov Report

Merging #3286 (ca5aec7) into master (3eb8566) will increase coverage by 53.44%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master    #3286       +/-   ##
===========================================
+ Coverage   35.32%   88.76%   +53.44%     
===========================================
  Files         671       79      -592     
  Lines       29310     9670    -19640     
  Branches     4341        0     -4341     
===========================================
- Hits        10353     8584     -1769     
+ Misses      17785     1086    -16699     
+ Partials     1172        0     -1172     

Flag	Coverage Δ
api-python	90.67% <100.00%> (-0.13%)	⬇️
catalog	?
lambda	86.07% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
api/python/quilt3/workflows/__init__.py	99.49% <ø> (ø)
api/python/tests/test_workflows.py	100.00% <100.00%> (ø)
api/python/quilt3/util.py	81.91% <0.00%> (-1.37%)	⬇️
api/python/tests/test_data_transfer.py	99.24% <0.00%> (-0.76%)	⬇️
api/python/quilt3/data_transfer.py	81.56% <0.00%> (-0.15%)	⬇️
catalog/app/containers/UriResolver/index.ts
...g/app/website/components/Backgrounds/Backlight1.js
catalog/app/components/Preview/loaders/fileType.ts
...AndPolicies/gql/PolicyUpdateUnmanaged.generated.ts
catalog/app/containers/NavBar/Search.js
... and 587 more

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[robnewman]

Fix the schema name - otherwise all good!