Add feature flag IdentityPinningViolationNotifications.

[bmarty]

Content

Disabled in production build, enabled by default on other builds.

Motivation and context

See linked issue (internal).

Screenshots / GIFs

Tests

• Ensure that when the flag is disabled, there is no pin violation notification displayed in the room.

Tested devices

• Physical
• Emulator
• OS version(s):

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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[sonarcloud]

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

Attention: Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.82%. Comparing base (366db47) to head (aa07ab1).
Report is 7 commits behind head on develop.

Files with missing lines	Patch %	Lines
.../android/libraries/featureflag/api/FeatureFlags.kt	87.50%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3648   +/-   ##
========================================
  Coverage    82.82%   82.82%           
========================================
  Files         1747     1747           
  Lines        41742    41754   +12     
  Branches      5102     5103    +1     
========================================
+ Hits         34572    34583   +11     
  Misses        5355     5355           
- Partials      1815     1816    +1     

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