test: fix race in overload integration test #14586
Merged
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Commit Message: Fix data race in overload integration test
Additional Description:
When the stream is deleted by the test ending, there is a race with deletion of the fake upstream.
Using the test member variable ensures that the stream isn't deleted until after the destructor
runs and cleans up the fake upstreams.
Risk Level: low - test only
Testing: ran affected test with TSAN 100 times before/after
Docs Changes: n/a
Release Notes: n/a
Platform Specific Features: n/a