feat: enable certificates relation on istio-pilot #678

Job	Run time
Run Tests / Integration Test (1.25-strict/stable)	6m 9s
Publish Charm / Generate the Charm Matrix	6s
Run Tests / Observability Integration Test (1.25-strict/stable)	6m 27s
Run Tests / Integration Test (1.26-strict/stable)	6m 3s
Run Tests / Observability Integration Test (1.26-strict/stable)	6m 43s
Run Tests / Lint Code (pilot)	29s
Run Tests / Lint Code (gateway)	28s
Run Tests / Unit Test (pilot)	48s
Run Tests / Unit Test (gateway)	38s
Run Tests / Check libraries (istio-gateway) / Check libraries	3s
Run Tests / Check libraries (istio-gateway) / Lint	14s
Run Tests / Check libraries (istio-pilot) / Check libraries	32s
Run Tests / Check libraries (istio-pilot) / Lint	12s
Publish Charm / Publish Charm (./charms/istio-gateway)	3m 41s
Publish Charm / Publish Charm (./charms/istio-pilot)	9m 17s
	41m 50s

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