Experimenting with C++ threads to replace Intel TBB #5150

Job	Run time
non-fun mix tests (windows-11-arm)	11m 2s
misc tests (windows-latest)	4m 56s
fwd tests (windows-11-arm)	9m 0s
rev tests (windows-11-arm)	26m 1s
prim tests (windows-11-arm)	53m 21s
fwd tests (windows-latest)	9m 5s
misc tests (windows-11-arm)	7m 2s
prim tests (ubuntu-24.04-arm)	41m 58s
rev tests (ubuntu-24.04-arm)	19m 47s
misc tests (ubuntu-24.04-arm)	3m 23s
mix fun and prob tests 3 (windows-11-arm)	37m 8s
prim tests (windows-latest)	1h 37m 42s
mix fun and prob tests 3 (ubuntu-24.04-arm)	27m 0s
non-fun mix tests (ubuntu-24.04-arm)	5m 22s
mix fun and prob tests 3 (windows-latest)	41m 6s
mix fun and prob tests 2 (windows-11-arm)	38m 23s
mix fun and prob tests 2 (windows-latest)	52m 22s
mix fun and prob tests 5 (ubuntu-24.04-arm)	2h 18m 53s
non-fun mix tests (windows-latest)	11m 27s
mix fun and prob tests 5 (windows-latest)	3h 50m 51s
mix fun and prob tests 5 (windows-11-arm)	2h 54m 25s
mix fun and prob tests 4 (ubuntu-24.04-arm)	28m 11s
mix fun and prob tests 1 (windows-11-arm)	41m 8s
mix fun and prob tests 1 (windows-latest)	45m 24s
mix fun and prob tests 4 (windows-11-arm)	38m 29s
mix fun and prob tests 2 (ubuntu-24.04-arm)	38m 20s
fwd tests (ubuntu-24.04-arm)	4m 23s
mix fun and prob tests 1 (ubuntu-24.04-arm)	30m 27s
rev tests (windows-latest)	44m 49s
mix fun and prob tests 4 (windows-latest)	37m 9s
	22h 28m 34s

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