Do not use REQUIRE() from multiple threads

[dthaler]

Describe the bug

Per https://github.com/catchorg/Catch2/blob/devel/docs/limitations.md#thread-safe-assertions
thread-safe REQUIRE() is not supported by catch2.

We currently have some tests, such as "sock_addr_invoke_concurrent1" in netebpfext_unit.cpp,
"multi_attach_concurrency_test1" in socket_tests.cpp, etc. that incorrectly call REQUIRE() in multiple concurrent threads,
which is not safe to do with catch2, as noted at the above link. This is by design since it says
"We currently do not plan to support thread-safe assertions."

I previously filed catchorg/Catch2#2935 but above link was the answer.

As such, we need to fix ebpf-for-windows to not do so. An alternative might be to set some global variable and exit the thread,
then do REQUIRE() back in the main test function once the threads exit.

OS information

No response

Steps taken to reproduce bug

Upgrade catch2 to latest.

Expected behavior

Upgrading catch2 should succeed.

Actual outcome

https://github.com/microsoft/ebpf-for-windows/actions/runs/12214862186/job/34076302844

Additional details

No response