fix(timeline): Add UTDs to the timeline conditionally

[jmartinesp]

Should fix element-hq/element-x-ios#3669.

Take into account the should_add parameter for including UTDs in the timeline, as is done for other types of events.

• Public API changes documented in changelogs (optional)

Signed-off-by:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.37%. Comparing base (5548f38) to head (153f9e7).
Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4525      +/-   ##
==========================================
- Coverage   85.38%   85.37%   -0.01%     
==========================================
  Files         285      285              
  Lines       31961    31962       +1     
==========================================
- Hits        27290    27288       -2     
- Misses       4671     4674       +3     

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[jmartinesp]

The test matrix_sdk_integration_testing::tests::sliding_sync::room::test_delayed_invite_response_and_sent_message_decryption seems to be consistently failing here because the timeline doesn't contain any event, although the only actual code change in this PR is the if should_add check and I've confirmed with a debugger that it's true, so it should behave just as before 🫤 .

EDIT: oops this is failing on main too 😬 .

[Hywan]

Thanks for the fix!