refactor power_event_watcher for configurable subscriber behavior #5368

Job	Run time
launcher (ubuntu-20.04)	3m 58s
package_builder (ubuntu-20.04)	41s
launcher (macos-12)	8m 52s
package_builder (macos-12)	1m 13s
launcher (windows-latest)	6m 25s
package_builder (windows-latest)	2m 49s
Version Baseline	2s
Exec Test (ubuntu-20.04)	5s
Exec Test (ubuntu-22.04)	9s
Exec Test (macos-12)	16s
Exec Test (macos-13)	18s
Exec Test (macos-14)	27s
Exec Test (windows-2019)	17s
Exec Test (windows-2022)	16s
ci_mergeable	1s
Store Artifacts (linux)	19s
Store Artifacts (macos)	45s
Store Artifacts (windows)	18s
	27m 11s

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