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There are a number of QUIC tests that are frequently failing, which seems can be related to dotnet/runtime#55979
This PR adds NonParallelizable attribute to all QUIC test fixtures and also reduces the number of test workers to 4, with these changes I have been running the test suite in a loop for several hours without failures, let's see if it results in more stable CI builds too.
Fixes #3696
Fixes #3701