Ensure that avatars always have a content description.

[bmarty]

Content

First commit: cleanup.
Second commit: Ensure that avatars always have a content description.

Motivation and context

Closes https://github.com/element-hq/customer-success/issues/549

Screenshots / GIFs

Tests

• Enalbe TalkBack / ScreenReader
• Navigate to the room details of a room with no avatar defined
• Click on the avatar
• Observe that the avatar is focusable and a text is said.

Tested devices

• Physical
• Emulator
• OS version(s):

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

[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

[github-actions]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.36%. Comparing base (f47b913) to head (0044875).
⚠️ Report is 4 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #5968   +/-   ##
========================================
  Coverage    81.36%   81.36%           
========================================
  Files         2535     2535           
  Lines        67626    67626           
  Branches      8669     8664    -5     
========================================
+ Hits         55022    55023    +1     
  Misses        9394     9394           
+ Partials      3210     3209    -1     

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[jmartinesp]

Thanks!