Profiling many spawn and sync does not work on Windows

[tkf]

@DilumAluthge noticed that the test I added in #43072 fails sometimes (presumably only) on Windows #43072 (comment)

The test is to run this script

julia/test/profile_spawnmany_exec.jl

Lines 5 to 14 in 455236e

	function spawnmany(n)
	if n > 2
	m = n ÷ 2
	t = Threads.@spawn spawnmany(m)
	spawnmany(m)
	wait(t)
	end
	end
	@profile spawnmany(parse(Int, get(ENV, "NTASKS", "2000000")))

and check that it does not error or time out. There's no backtrace from this script (yet) because I forgot to redirect stdout and stderr.

[tkf]

The initial version of #43125 contained some logging upon error and...

I get the log output

┌ Error: Failed test: "spawn and wait *a lot* of tasks in @profile" (n = 2000000)
│ 
...
│   proc.exitcode = 3221225477
│   proc.termsignal = 0

in https://build.julialang.org/#/builders/65/builds/5543

3221225477 is STATUS_ACCESS_VIOLATION so there's something wrong. But it looks like there's no backtrace.

Note that n = 2000000 is the largest number of tasks in the test. I wonder if ignoring this case is sufficient.

--- #43125 (comment)

[tkf]

@vtjnash noticed that Windows CI can hit the timeout too (even after #43125):

Error in testset threads:
Test Failed at C:\buildbot\worker-tabularasa\tester_win64\build\share\julia\test\threads.jl:214
  Expression: !timeout

https://build.julialang.org/#/builders/65/builds/5821

[tkf]

Oops, my PR comment in #43247 contained a substring fixes #43124.

[LilithHafner]

This also fails somtimes on mac (see https://buildkite.com/julialang/julia-master/builds/24520#0188847a-6af8-4be7-92cd-c03932978df4/591-594)

┌ Error: A "spawn and wait lots of tasks" test failed
│   n = 2000000
│   proc.exitcode = 0
│   proc.termsignal = 15
│   success(proc) = false
│   timeout = true
└ @ Main.Test31Main_threads /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-macmini-x64-4.0/build/default-macmini-x64-4-0/julialang/julia-master/julia-f407a4cac3/share/julia/test/threads.jl:313
  threads                                           (1) \|         failed at 2023-06-04T00:31:23.823
Test Failed at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-macmini-x64-4.0/build/default-macmini-x64-4-0/julialang/julia-master/julia-f407a4cac3/share/julia/test/threads.jl:319
  Expression: success(proc)
   
Test Failed at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-macmini-x64-4.0/build/default-macmini-x64-4-0/julialang/julia-master/julia-f407a4cac3/share/julia/test/threads.jl:320
  Expression: !timeout

on test x86_64-apple-darwin