Build: add snapshot package changes tab

[dominikvagner]

Summary

Expose added, removed, and updated RPM diffs from snapshot detail, so snapshot list changes can be inspected in place.

#testwith content-services/content-sources-backend#1535

Testing steps

[codecov]

Codecov Report

❌ Patch coverage is 79.11392% with 33 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.29%. Comparing base (8633026) to head (87fe839).

Files with missing lines	Patch %	Lines
...s/SnapshotDetailsModal/Tabs/SnapshotChangesTab.tsx	80.16%	15 Missing and 9 partials ⚠️
...ents/SnapshotDetailsModal/SnapshotDetailsModal.tsx	70.00%	0 Missing and 3 partials ⚠️
...mponents/SnapshotDetailsModal/SnapshotSelector.tsx	40.00%	3 Missing ⚠️
...components/SnapshotListModal/SnapshotListModal.tsx	76.92%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1037      +/-   ##
==========================================
+ Coverage   58.93%   59.29%   +0.36%     
==========================================
  Files         137      138       +1     
  Lines        5199     5339     +140     
  Branches      993     1023      +30     
==========================================
+ Hits         3064     3166     +102     
- Misses       1900     1928      +28     
- Partials      235      245      +10     

Flag	Coverage Δ
e2e	59.29% <79.11%> (+0.36%)	⬆️

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

Files with missing lines	Coverage Δ
src/services/Content/ContentApi.ts	85.21% <100.00%> (+0.53%)	⬆️
src/services/Content/ContentQueries.ts	62.79% <100.00%> (+0.62%)	⬆️
...ents/SnapshotDetailsModal/SnapshotDetailsModal.tsx	90.24% <70.00%> (-1.43%)	⬇️
...mponents/SnapshotDetailsModal/SnapshotSelector.tsx	79.48% <40.00%> (-3.85%)	⬇️
...components/SnapshotListModal/SnapshotListModal.tsx	82.90% <76.92%> (-0.58%)	⬇️
...s/SnapshotDetailsModal/Tabs/SnapshotChangesTab.tsx	80.16% <80.16%> (ø)

... and 2 files with indirect coverage changes

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