Add `broadcast_sigterm_every_n_steps` to reduce SIGTERM broadcast overhead #30459

Job	Run time
build-packages / build-packages (pytorch)	22s
build-packages / build-packages (lightning)	26s
build-packages / build-packages (fabric)	24s
build-packages / merge-artifacts	7s
install-pkg (ubuntu-22.04, lightning, 3.10)	1m 30s
install-pkg (ubuntu-22.04, pytorch, 3.11)	1m 32s
install-pkg (ubuntu-22.04, notset, 3.11)	1m 30s
install-pkg (macOS-14, fabric, 3.11)	36s
install-pkg (macOS-14, pytorch, 3.10)	53s
install-pkg (ubuntu-22.04, notset, 3.10)	1m 35s
install-pkg (ubuntu-22.04, lightning, 3.11)	1m 30s
install-pkg (macOS-14, fabric, 3.10)	1m 6s
install-pkg (macOS-14, lightning, 3.11)	36s
install-pkg (ubuntu-22.04, fabric, 3.10)	2m 1s
install-pkg (macOS-14, notset, 3.11)	55s
install-pkg (macOS-14, pytorch, 3.11)	36s
install-pkg (ubuntu-22.04, fabric, 3.11)	1m 27s
install-pkg (ubuntu-22.04, pytorch, 3.10)	1m 28s
install-pkg (windows-2022, pytorch, 3.11)	2m 3s
install-pkg (macOS-14, notset, 3.10)	1m 5s
install-pkg (macOS-14, lightning, 3.10)	53s
install-pkg (windows-2022, pytorch, 3.10)	1m 39s
install-pkg (windows-2022, notset, 3.10)	1m 52s
install-pkg (windows-2022, lightning, 3.10)	1m 46s
install-pkg (windows-2022, lightning, 3.11)	1m 44s
install-pkg (windows-2022, fabric, 3.10)	1m 26s
install-pkg (windows-2022, fabric, 3.11)	1m 36s
install-pkg (windows-2022, notset, 3.11)	1m 37s
install-pkg-guardian	2s
	34m 17s

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