Rename metadata to user metadata

[fiskus]

• Changelog entry (skip if change is not significant to end users, e.g. docs only)

[codecov]

Codecov Report

Merging #3255 (cd7faa6) into master (cc11d76) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master    #3255   +/-   ##
=======================================
  Coverage   35.11%   35.11%           
=======================================
  Files         665      665           
  Lines       29081    29081           
  Branches     4281     4281           
=======================================
  Hits        10213    10213           
  Misses      17678    17678           
  Partials     1190     1190           

Flag	Coverage Δ
api-python	90.79% <ø> (ø)
catalog	8.38% <0.00%> (ø)
lambda	86.05% <ø> (ø)

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

Impacted Files	Coverage Δ
...alog/app/components/SearchResults/SearchResults.js	0.00% <ø> (ø)
...iners/Bucket/PackageRevisions/PackageRevisions.tsx	0.00% <0.00%> (ø)

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