Add alert rules to istio-pilot based on the KF093 spec #1126

Job	Run time
Publish Charm / Generate the Charm Matrix	3s
Run Tests / Integration Test (1.27-strict/stable, integration)	14m 19s
Run Tests / Integration Test (1.27-strict/stable, integration-tls-provider)	14m 19s
Run Tests / Integration Test (1.27-strict/stable, integration-tls-secret)	14m 9s
Run Tests / Integration Test (1.30-strict/stable, integration)	14m 15s
Run Tests / Integration Test (1.30-strict/stable, integration-tls-provider)	14m 9s
Run Tests / Integration Test (1.30-strict/stable, integration-tls-secret)	14m 16s
Run Tests / Observability Integration Test (1.25-strict/stable)	14m 12s
Run Tests / Observability Integration Test (1.26-strict/stable)	14m 9s
Run Tests / Lint Code (pilot)	21s
Run Tests / Lint Code (gateway)	22s
Run Tests / Unit Test (pilot)	44s
Run Tests / Unit Test (gateway)	33s
Run Tests / Check libraries (istio-gateway) / Check libraries	35s
Run Tests / Check libraries (istio-gateway) / Lint	10s
Run Tests / Check libraries (istio-pilot) / Check libraries	28s
Run Tests / Check libraries (istio-pilot) / Lint	11s
Publish Charm / Publish Charm (./charms/istio-pilot)	13m 30s
Publish Charm / Publish Charm (./charms/istio-gateway)	13m 29s
	2h 24m 14s

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