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.

Redaction and redacted events are no longer considered suitable.

This patch also revisits rfind_map_event_in_memory_by to return a &TimelineEvent instead of an OwnedEventId, which could be more performant in the future.

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
• Address [meta] Latest Event API, the missing one #4112

[codecov]

Codecov Report

❌ Patch coverage is 95.34884% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.49%. Comparing base (76cae09) to head (79e394c).
⚠️ Report is 1 commits behind head on main.
✅ 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 ⚠️
...rates/matrix-sdk/src/latest_events/latest_event.rs	97.05%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5932      +/-   ##
==========================================
- Coverage   88.50%   88.49%   -0.01%     
==========================================
  Files         362      362              
  Lines      103438   103423      -15     
  Branches   103438   103423      -15     
==========================================
- Hits        91549    91529      -20     
- Misses       7539     7544       +5     
  Partials     4350     4350              

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[codspeed-hq]

CodSpeed Performance Report

Merging #5932 will not alter performance

_{Comparing Hywan:fix-issue-5899 (79e394c) with main (76cae09)}

Summary

✅ 50 untouched

[stefanceriu]

lgtm 👍