refactor!: remove `ActsScalar` #25911

Job	Run time
linux_ubuntu	52m 47s
macos	30m 39s
linux_ubuntu_extra (ubuntu2204, 20)	46m 48s
linux_ubuntu_extra (ubuntu2204_clang, 20)	52m 52s
linux_examples_test	13m 17s
linux_physmon	19m 10s
linux_physmon_perf_report	0s
	3h 35m 33s

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