ci: Reduce build job count to 2 #18333

Job	Run time
cuda	1m 35s
linux_ubuntu	4m 41s
linux_ubuntu_extra (ubuntu2004, 17)	11m 56s
linux_ubuntu_extra (ubuntu2204_cpp20, 20)	5m 20s
linux-nodeps (centos8-lcg100-gcc10)	11m 45s
macos	11m 25s
linux_ubuntu_extra (ubuntu2204_clang, 17)	4m 58s
sycl	1m 54s
linux_physmon	26m 3s
linux_examples_test	13m 3s
linux_physmon_perf_report	0s
	1h 32m 40s

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