fix : use RoomMembershipObserver to close room screen when leaving

[ganfra]

Content

Close the room flow when leaving a room from the client.
If leaving, being banned from another client, the room screen will update but won't navigate up to the room list.

Motivation and context

Screenshots / GIFs

No ui change.

Tests

• Step 1
• Step 2
• Step ...

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 SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.85%. Comparing base (86a6244) to head (e75d6fa).
Report is 20 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3887      +/-   ##
===========================================
- Coverage    82.87%   82.85%   -0.02%     
===========================================
  Files         1784     1784              
  Lines        45090    45088       -2     
  Branches      5324     5323       -1     
===========================================
- Hits         37368    37358      -10     
- Misses        5857     5865       +8     
  Partials      1865     1865              

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