Hide timeline media preparation

[pixlwave]

Cherry picking a couple of commits in preparation for #3228 that aren't specifically related to the changes:

• Use the new @Entry macro for Environment values.
• MockMediaProvider → MediaProviderMock using Sourcery.

[github-actions]

	Warnings
⚠️	Some of the commits are missing ticket numbers. Please consider squashing all commits that don't have a tracking number.
⚠️	You seem to have made changes to views. Please consider adding screenshots.

Generated by 🚫 Danger Swift against 4c3218a

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
1.4% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.53%. Comparing base (e0ee4be) to head (4c3218a).
Report is 2 commits behind head on develop.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3361      +/-   ##
===========================================
+ Coverage    77.49%   77.53%   +0.03%     
===========================================
  Files          740      739       -1     
  Lines        59824    59814      -10     
===========================================
+ Hits         46363    46378      +15     
+ Misses       13461    13436      -25     

Flag	Coverage Δ
unittests	68.94% <100.00%> (+0.04%)	⬆️

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