fix: add Importance 0 for notification channels (#2507) (#2508) #5671

Job	Run time
setup (macos-15)	1m 4s
setup (ubuntu-latest)	53s
lint-scripts	32s
lint (local-notifications)	24s
lint (push-notifications)	31s
verify-ios (/Applications/Xcode_16.app, local-notifications)	4m 41s
verify-web (local-notifications)	26s
verify-android (push-notifications)	2m 8s
verify-web (push-notifications)	24s
verify-ios (/Applications/Xcode_16.app, push-notifications)	5m 41s
verify-android (local-notifications)	1m 50s
	18m 34s

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