Investigate failing platform unit tests

[ProjectsByJackHe]

Describe the bug

In this PR: https://github.com/microsoft/msquic/pull/4199, we are intentionally skipping the platform unit tests because their failures messed up the code coverage in BVT.

That was a temporary solution, we should find out why the platform unit tests were failing to begin with.

Affected OS

• [ ] Windows
• [ ] Linux
• [ ] macOS
• [ ] Other (specify below)

Additional OS information

No response

MsQuic version

main

Steps taken to reproduce bug

CI

Expected behavior

platform unit tests should pass

Actual outcome

they don't pass

Additional details

No response