🐛 Extend notification delay & fix broken delay customization #5866

Job	Run time
build-and-upload-for-global-ci	3m 56s
unit-test (18.x)	4m 19s
test-integration / e2e-ui-integration-tests (tier0)	31m 40s
test-integration / e2e-api-integration-tests	0s
	39m 55s

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