fix(sdk): Better handling of redacted and redaction events in Latest Event

[Hywan]

This patch revisits the way redacted and redaction events are handled in the Latest Event.

Previously, all redacted events were considered suitable candidate. It's no longer the case.

Only redaction event (m.room.redaction) are considered suitable candidate if and only if it targets the immediate previous event, and if and only if the previous event is itself a suitable candidate.

To achieve so, the rfind_map_event_in_memory_by method is revisited to return the &TimelineEvent instead of the OwnedEventId.

The tests have been updated accordingly.

---

• Fix Adding a reaction and removing it bumps a room to the top of the room list and clears its last message. #5899

[codecov]

Codecov Report

❌ Patch coverage is 98.96907% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 88.51%. Comparing base (238e4e8) to head (61bc261).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
crates/matrix-sdk/src/event_cache/room/mod.rs	88.88%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5932      +/-   ##
==========================================
+ Coverage   88.50%   88.51%   +0.01%     
==========================================
  Files         362      362              
  Lines      103291   103339      +48     
  Branches   103291   103339      +48     
==========================================
+ Hits        91413    91469      +56     
+ Misses       7535     7528       -7     
+ Partials     4343     4342       -1     

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[codspeed-hq]

CodSpeed Performance Report

Merging #5932 will not alter performance

_{Comparing Hywan:fix-issue-5899 (61bc261) with main (238e4e8)}

Summary

✅ 50 untouched