Fetch the initial ignored user list manually when subscribing

[jmartinesp]

Content

The SDK won't return it automatically, so we need to fetch it manually.

Motivation and context

Fixes #4597

Tests

• You should see the ignored user list as soon as you open the settings screen if you had any ignored users.
• If you comment out the changes and restart the app, it'll be missing until you ignore/unignore someone.

Tested devices

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

Checklist

• Changes have been tested on an Android device or Android emulator with API 24
• 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
• 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 SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.01%. Comparing base (f74486f) to head (6a64250).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #4598      +/-   ##
===========================================
- Coverage    80.01%   80.01%   -0.01%     
===========================================
  Files         2103     2103              
  Lines        55646    55647       +1     
  Branches      6930     6930              
===========================================
  Hits         44527    44527              
- Misses        8723     8724       +1     
  Partials      2396     2396              

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[bmarty]

Thanks for the fast fix!