[a11y] Make more items focusable

[bmarty]

Content

• First commit: Ensure that the settings can be open when the screen reader is active and the account has no avatar.
• Second commit: Ktx cleanup (unrelated to a11y, but fixes IDE warning, and improve the code, do not want to create a dedicated PR just for that)
• Third commit: ensure that the screen reader can focus on the user avatar in the edit profile view.

Motivation and context

Closes #4599 and improve a11y of the application.

Screenshots / GIFs

Tests

• Enable screen reader
• on an account with no avatar, ensure that the user can open the settings
• ensure that the user can update the account avatar

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

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 70.37037% with 8 lines in your changes missing coverage. Please review.

Project coverage is 80.01%. Comparing base (47c7a74) to head (de11e83).
Report is 4 commits behind head on develop.

Files with missing lines	Patch %	Lines
...droid/libraries/androidutils/system/SystemUtils.kt	0.00%	2 Missing ⚠️
...d/features/call/impl/utils/CallIntentDataParser.kt	50.00%	0 Missing and 1 partial ⚠️
...o/element/android/features/login/impl/util/Util.kt	0.00%	1 Missing ⚠️
...impl/web/WebClientUrlForAuthenticationRetriever.kt	0.00%	1 Missing ⚠️
.../libraries/androidutils/browser/ChromeCustomTab.kt	0.00%	1 Missing ⚠️
...es/matrix/impl/permalink/DefaultPermalinkParser.kt	0.00%	1 Missing ⚠️
.../libraries/oidc/impl/customtab/CustomTabHandler.kt	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #4605   +/-   ##
========================================
  Coverage    80.00%   80.01%           
========================================
  Files         2103     2103           
  Lines        55749    55758    +9     
  Branches      6940     6941    +1     
========================================
+ Hits         44603    44612    +9     
  Misses        8752     8752           
  Partials      2394     2394           

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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

[jmartinesp]

Thanks!