Add alert rules to knative-operator based on the KF093 spec #462

Job	Run time
Publish Charm / Generate the Charm Matrix	5s
Run Tests / Integration Test	37m 30s
Run Tests / Observability Integration Test	34m 27s
Run Tests / Lint Code (operator)	22s
Run Tests / Lint Code (serving)	40s
Run Tests / Unit Test (operator)	29s
Run Tests / Lint Code (eventing)	22s
Run Tests / Unit Test (serving)	24s
Run Tests / Unit Test (eventing)	25s
Run Tests / Check libraries / Check libraries	4s
Run Tests / Check libraries / Lint	11s
Publish Charm / Publish Charm (./charms/knative-eventing)	13m 55s
Publish Charm / Publish Charm (./charms/knative-operator)	19m 5s
Publish Charm / Publish Charm (./charms/knative-serving)	14m 0s
	2h 1m 59s

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