Add a `serverless-gclb` module. #182

Job	Run time
docs (authorize-private-service)	9s
docs (cloudevent-broker)	9s
docs (cloudevent-trigger)	8s
docs (cloudevent-recorder)	10s
docs (regional-go-service)	9s
docs (serverless-gclb)	7s
docs (otel-collector)	6s
docs (networking)	11s
docs (dashboard/service)	4s
docs (dashboard/job)	9s
docs (dashboard/cloudevent-receiver)	6s
	1m 28s

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