add support for pubsub channel in alerting module #1151

Job	Run time
docs (authorize-private-service)	14s
docs (bucket-events)	17s
docs (cloudevent-broker)	14s
docs (cloudevent-trigger)	13s
docs (cloudevent-recorder)	14s
docs (regional-go-service)	17s
docs (regional-service)	16s
docs (serverless-gclb)	14s
docs (networking)	16s
docs (dashboard/service)	16s
docs (dashboard/job)	17s
docs (dashboard/cloudevent-receiver)	14s
docs (prober)	16s
docs (cron)	14s
docs (configmap)	14s
docs (secret)	18s
docs (github-bots)	14s
docs (github-wif-provider)	15s
docs (github-gsa)	16s
docs (github-events)	20s
docs (workqueue)	18s
conclusion	9s
	5m 36s

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