chore: Newline after `#pragma once` #26501

Job	Run time
linux_ubuntu	51m 47s
linux_ubuntu_extra (ubuntu2204, 20)	44m 41s
linux_ubuntu_extra (ubuntu2204_clang, 20)	54m 55s
macos	29m 31s
linux_examples_test	14m 45s
linux_physmon	20m 51s
linux_physmon_perf_report	0s
	3h 36m 30s

Provide feedback