Make pinned events required state in SlidingSync

[jmartinesp]

Content

Make pinned events required state in SlidingSync.

Motivation and context

This is needed to always have the pinned events of a room as soon as we open it.

Tests

• Enable pinned events in developer settings.
• Clear cache.
• Open a room with pinned events that hasn't pinned/unpinned a new one in a while.

The pinned events should be loaded.

Tested devices

• Physical
• Emulator
• OS version(s): 14

Checklist

• Changes have been tested on an Android device or Android emulator with API 23
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/element-hq/element-x-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request title will be used in the release note, it clearly define what will change for the user
• Pull request includes screenshots or videos if containing UI changes
• Pull request includes a sign off
• You've made a self review of your PR

[github-actions]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.59%. Comparing base (ae3fd89) to head (1caf4fb).
Report is 3 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3385   +/-   ##
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  Coverage    82.59%   82.59%           
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  Files         1693     1693           
  Lines        39646    39646           
  Branches      4822     4822           
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  Hits         32745    32745           
  Misses        5216     5216           
  Partials      1685     1685           

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