Enable "Test spawning a lot of tasks" on non-Linux

[tkf]

This re-enables the bug reproducer test #42975 spawn and wait *a lot* of tasks in @profile (fixed in #42978) for non-Linux platforms so that people using Windows, macOS, and FreeBSD can pick it up.

Ref: #42978 (comment)

[tkf]

It looks like macOS and FreeBSD are actually fine? Or maybe increasing the timeout bf070fc helped?

https://build.julialang.org/#/builders/26/builds/5861
https://build.julialang.org/#/builders/78/builds/5216

[tkf]

It works even on Windows
https://build.julialang.org/#/builders/49/builds/6250
https://build.julialang.org/#/builders/90/builds/6235

[tkf]

@vtjnash Since the main fix 17a70d2 in #42978 was OS-agnostic, maybe #42978 was enough for all OSes? Or do you want to do something equivalent to pthread_cond_timedwait e001bc7 in Windows and macOS?

[vtjnash]

The usage of pthread_cond_timedwait is just because the linux kernel is unreliable here. The other kernels don't have that problem and therefore that isn't needed.

[DilumAluthge]

@tkf @vtjnash I'm seeing this test fail on CI intermittently, but (AFAICT) only on Windows.

Could we add an if !Sys.iswindows(), or something like that?

[DilumAluthge]

Here's an example failure on tester_win64: https://build.julialang.org/#/builders/65/builds/5532

[tkf]

Yeah, I think we need to disable this. I just opened #43125.