"Send test notification" button - improved error handling, code refactor #7072

Job	Run time
lint-code	6s
test-application-3-13 / test-application	11m 5s
test-application-3-11 / test-application	10m 58s
test-application-3-12 / test-application	11m 16s
test-application-3-10 / test-application	11m 22s
	44m 47s

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