Fix not being able to decline an invite from the room list

[jmartinesp]

Content

• Use the new RoomListItem.invitedRoom() API to get a room in an invited membership state that won't need a timeline to work.
• When calling the 'decline invite' APIs using AcceptDeclineInvitePresenter get an invited room instead of the full room and decline the invite.

Motivation and context

Fixes #3407.

Note the implementation is a quick fix and some iteration on this issue is encouraged: ideally, we'd have JoinedRoom and InvitedRoom abstractions that share a minimum of logic, and maybe both implement a simplified MatrixRoom.

Tests

• Get an invite in the room list.
• Decline it.
• Get another invite.
• Open its preview by tapping on the item.
• Decline it.

Tested devices

• Physical
• Emulator
• OS version(s): 14

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 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.63%. Comparing base (764692b) to head (499aaef).

Files with missing lines	Patch %	Lines
...vite/impl/response/AcceptDeclineInvitePresenter.kt	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3466   +/-   ##
========================================
  Coverage    82.63%   82.63%           
========================================
  Files         1701     1702    +1     
  Lines        40047    40055    +8     
  Branches      4872     4872           
========================================
+ Hits         33092    33100    +8     
  Misses        5234     5234           
  Partials      1721     1721           

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[bmarty]

LGTM, thanks!