Revert "fix(sdk): Disable OrderTracker for the moment."

[Hywan]

This patch reverts #5407.

It must be merged once #5411 is merged!

[codecov]

Codecov Report

Attention: Patch coverage is 78.92720% with 55 lines in your changes missing coverage. Please review.

Project coverage is 88.81%. Comparing base (c5f2460) to head (189832e).
Report is 27 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	79.52%	38 Missing and 5 partials ⚠️
crates/matrix-sdk/src/event_cache/room/events.rs	76.47%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5412      +/-   ##
==========================================
- Coverage   88.84%   88.81%   -0.03%     
==========================================
  Files         334      334              
  Lines       91015    91256     +241     
  Branches    91015    91256     +241     
==========================================
+ Hits        80861    81051     +190     
- Misses       6341     6390      +49     
- Partials     3813     3815       +2     

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[bnjbvr]

yay