fix(ui): Disable share_pos() inside RoomListService

[Hywan]

This patch disables the call to share_pos() inside the RoomListService because it creates slowness we need to investigate.

---

• Fix PaginationStatusListener isn't sending paginating until the pagination is finished. #4244
• Address Activate share_pos on the room-list sliding sync instance #4035
• Reopen SSS: Persist the pos token so that it gets reused across app restarts #3936

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.90%. Comparing base (9dd2d5e) to head (c11af7c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4256      +/-   ##
==========================================
- Coverage   84.95%   84.90%   -0.05%     
==========================================
  Files         274      274              
  Lines       29768    29768              
==========================================
- Hits        25288    25275      -13     
- Misses       4480     4493      +13     

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