tests: build charms sequentially #1163

Job	Run time
Run Tests / Lint Code (pilot)	22s
Run Tests / Lint Code (gateway)	23s
Publish Charm / Generate the Charm Matrix	2s
Run Tests / Observability Integration Test (1.25-strict/stable)	1h 14m 3s
Run Tests / Integration Test (1.25-strict/stable, integration)	1h 8m 49s
Run Tests / Observability Integration Test (1.26-strict/stable)	1h 7m 54s
Run Tests / Integration Test (1.25-strict/stable, integration-tls-provider)	1h 8m 51s
Run Tests / Integration Test (1.25-strict/stable, integration-tls-secret)	1h 8m 38s
Run Tests / Unit Test (pilot)	8m 38s
Run Tests / Integration Test (1.26-strict/stable, integration)	1h 8m 50s
Run Tests / Unit Test (gateway)	31s
Run Tests / Integration Test (1.26-strict/stable, integration-tls-provider)	1h 8m 49s
Run Tests / Integration Test (1.26-strict/stable, integration-tls-secret)	1h 8m 32s
Run Tests / Check libraries (istio-gateway) / Check libraries	3s
Run Tests / Check libraries (istio-gateway) / Lint	32s
Run Tests / Check libraries (istio-pilot) / Check libraries	35s
Run Tests / Check libraries (istio-pilot) / Lint	8s
Publish Charm / Publish Charm (./charms/istio-pilot)	41m 3s
Publish Charm / Publish Charm (./charms/istio-gateway)	17m 39s
	10h 24m 22s

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