Add and remove CPU from epoch computation on active and idle #12039

Job	Run time
netperf	0s
codeql	0s
regular_native-only / build (NativeOnlyDebug)	23s
regular / build (Debug)	22s
regular_native-only / build (NativeOnlyRelease)	25s
regular / build (FuzzerDebug)	26s
analyze / build (Debug)	27s
onebranch / build (NativeOnlyDebug)	25s
regular / build (Release)	27s
analyze / build (Release)	21s
onebranch / build (NativeOnlyRelease)	28s
sanitize / build (Debug)	28s
sanitize / build (Release)	23s
upload_netperf_results_azure_2022	0s
upload_netperf_results_lab_2022	0s
driver_native_only_ws2019	1s
unit_tests_native_only	1s
driver_native_only_ws2022	1s
netebpf_ext_unit_tests	1s
bpf2c	1s
unit_tests_appverif	1s
bpf2c_conformance	1s
driver_ws2019	1s
ossar	1s
driver_ws2022	1s
regression_driver_ws2022	1s
unit_tests	1s
bpf2c_fuzzer	1s
bpf2c_fuzzer_scheduled	1s
cilium_tests	1s
core_helper_fuzzer	1s
execution_context_fuzzer	1s
netebpfext_fuzzer	1s
verifier_fuzzer	1s
verifier_fuzzer_scheduled	1s
fault_injection	1s
fault_injection_full	1s
fault_injection_netebpfext_unit	1s
km_mt_stress_tests	1s
km_mt_stress_tests_restart_extension	1s
netebpfext_fault_injection_full	1s
performance	1s
quick_user_mode_multi_threaded_stress_test	1s
stress	1s
user_mode_multi_threaded_stress_test	1s
upload_perf_results	1s
sanitize_unit_tests	1s
	5m 7s

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