fix(send queue): when adding a local reaction, look for media events in dependent requests too

[bnjbvr]

This allows reacting to a local media upload.

Adding a reaction to a local echo would check that the target of the reaction (identified by its transaction id) is part of the requests, but not part of the dependent requests. For a media upload, it's more likely the media event will be alive as a dependent request of kind FinishUpload, so we need to check there too. With that fix, it's then possible to react to a local media upload.

Part of #4201.

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 85.13%. Comparing base (f20401c) to head (8abb51f).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/matrix-sdk-base/src/store/send_queue.rs	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4294      +/-   ##
==========================================
- Coverage   85.15%   85.13%   -0.02%     
==========================================
  Files         274      274              
  Lines       30139    30147       +8     
==========================================
+ Hits        25665    25667       +2     
- Misses       4474     4480       +6     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

---

🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests

[stefanceriu]

Oh super nice, makes perfect sense to me! 👍