[release/8.0] Fix Http2 MultiConnection test race conditions #91343
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Backport of #91156 to release/8.0
Fixes #91075
/cc @MihaZupan
Customer Impact
Test-only change to decrease noise in CI.
On 8.0 release branches, it passes on rerun about 2x a day, failed once.
Testing
Observed CI main runs for ~2 days (and counting) without any failures (previously ~10x PassedOnRerun failures a day).
Risk
None. Test-only change.