build: Add target to build all unit tests #16714

Job	Run time
linux_ubuntu	5m 9s
cuda	1m 29s
linux_ubuntu_extra (ubuntu2004, 17)	7m 54s
linux-nodeps (centos8-lcg100-gcc10)	14m 29s
linux_ubuntu_extra (ubuntu2204_cpp20, 20)	4m 54s
linux_ubuntu_extra (ubuntu2204_clang, 17)	4m 35s
macos	9m 29s
sycl	3m 44s
linux_physmon	25m 35s
linux_examples_test	18m 29s
linux_physmon_perf_report	0s
	1h 35m 47s

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