ci(parallel): run parallel build against serial tests #3086

Job	Run time
Build	1m 43s
Check format	1m 47s
Smoke test	5m 47s
Parallel testing (ubuntu-22.04)	32m 44s
Test GNU fortran (ubuntu-22.04)	38m 9s
Extended executable testing (ubuntu-22.04)	17m 51s
Parallel testing (macos-12)	55m 45s
Test GNU fortran (macos-12)	25m 45s
Test Intel fortran (ubuntu-22.04)	39m 28s
Extended executable testing (macos-12)	41m 15s
Parallel testing (windows-2022)	52m 51s
Test Intel fortran (macos-12)	34m 42s
Test GNU fortran (macos-14)	20m 40s
Test Intel fortran (windows-2022)	35m 4s
Test GNU fortran (windows-2022)	30m 36s
	7h 14m 7s

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