[PATCH 0/1] MR10125: mf/tests: Fix potential race conditions in test.

[Brendan McGrath (＠redmcg)]

This fixes two potential race conditions that were added to the tests in MR !10055:
1. That we can process the `sample_event` and check the sinks collection count
   prior to the sink adding the new sample to its collection; and
2. That the source stream can add multiple samples to its collection within
   the time it takes for us to process a single event.

These race conditions can unfortunately cause intermittent test failures.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/10125