Split `compile` tests from `run` tests #2012

Job	Run time
build (--test-libcore)	1m 4s
build (--mini-tests)	1m 0s
build (--test-successful-rustc --nb-parts 2 --current-part 1)	1m 3s
build (--test-successful-rustc --nb-parts 2 --current-part 0)	1m 6s
build (--std-tests)	1m 7s
success_gcc12	3s
	5m 23s

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