Adapt to new DM definition changes in the SDK

[jmartinesp]

Content

These changes try to centralise every check about whether a room is a DM or not using the new SDK APIs.

• Use ClientBuilder.dmRoomDefinition(DmRoomDefinition.TwoPeople), which makes the SDK consider a DM a room with 1 direct target and at most two non-service members in it.
• Add RoomMember.isServiceMember to tell apart normal room member and service/functional ones.
• Use Room.isDm as a shortcut to Room.roomInfoFlow.value.isDm, remove all other isDm implementations so only the SDK one is valid.
• Replace isDirect checks with isDm where possible for Room, SpaceRoom, RoomInfo, etc.

Motivation and context

Centralises how the DM checks are done.

Fixes #6717.
Also fixes #4034, since the previous issue is a task that implements the needed changes.

Screenshots / GIFs

No screenshot changes, since just the internal checks changed.

Tests

• Check a direct room with > 2 users is not a DM.
• Check a direct room with <= 2 non service users and the rest of them being service users is a DM.
• Check DMs don't display the avatar or display name of the service members (they're not part of the heroes).
• Notifications and incoming calls also tell apart DMs from non-DMs correctly based on the same logic.

Tested devices

• Physical
• Emulator
• OS version(s): 15

Checklist

• This PR was made with the help of AI:
  • Yes. In this case, please request a review by Copilot.
  • No.
• 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 defines 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

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[codecov]

Codecov Report

❌ Patch coverage is 87.23404% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.22%. Comparing base (245c30c) to head (269b4f3).

Files with missing lines	Patch %	Lines
...ns/edit/EditDefaultNotificationSettingPresenter.kt	83.33%	0 Missing and 1 partial ⚠️
...roid/libraries/matrix/api/analytics/ViewRoomExt.kt	0.00%	1 Missing ⚠️
...roid/libraries/matrix/api/room/RoomMembersState.kt	0.00%	0 Missing and 1 partial ⚠️
...ies/matrix/impl/notification/NotificationMapper.kt	50.00%	0 Missing and 1 partial ⚠️
...droid/libraries/matrix/impl/room/JoinedRustRoom.kt	0.00%	1 Missing ⚠️
...android/libraries/matrix/impl/room/RustBaseRoom.kt	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #6748   +/-   ##
========================================
  Coverage    81.22%   81.22%           
========================================
  Files         2634     2633    -1     
  Lines        73469    73488   +19     
  Branches      9496     9495    -1     
========================================
+ Hits         59676    59694   +18     
  Misses       10301    10301           
- Partials      3492     3493    +1     

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[frebib]

I swapped out my patches for this and it seems to work perfectly.
This PR fixes #4034

[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