CI: enhance FreeBSD staging tests #2261

Job	Run time
build-tests(ubuntu-24.04,gcc,maximus)	46s
functionality-tests	44s
build-tests(ubuntu-24.04,gcc,default)	49s
source-maintenance-tests	48s
build-tests(ubuntu-24.04,gcc,minimal)	40s
CodeQL-tests	43s
build-tests(ubuntu-24.04,clang,maximus)	38s
build-tests(ubuntu-24.04,clang,default)	40s
build-tests(ubuntu-24.04,clang,minimal)	50s
	6m 38s

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