Oidc: Fallback to external browser instead of using Webview

[bmarty]

Content

Stop using Webview for Oidc when custom chrome tab is not available. Use a web browser instead.

Motivation and context

Replacement for #4293

Screenshots / GIFs

Tests

• Can be tested without touching the code by doing a sign in, and when in the custom chrome tab, click the menu button and select "Open in [Chrome/Firefox/...] browser"
• You can also test the reset identity flow.

Tested on my side, also the cancel flow, where the user kill the browser task and navigate back to the app. After 5 seconds, the continue button get enabled again as expected.

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

All modified and coverable lines are covered by tests ✅

Project coverage is 80.46%. Comparing base (0953789) to head (7f09216).
Report is 3 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #4808      +/-   ##
===========================================
+ Coverage    80.40%   80.46%   +0.05%     
===========================================
  Files         2149     2140       -9     
  Lines        56843    56725     -118     
  Branches      7125     7108      -17     
===========================================
- Hits         45703    45642      -61     
+ Misses        8689     8636      -53     
+ Partials      2451     2447       -4     

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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