upgrade @google-cloud/pubsub to v4.4.0 (major upgrade) #26908

Job	Run time
check-json-schema (20)	1m 46s
check-package-lock (20)	11s
lint	0s
check-package-lock-vsce (20)	9s
unit (18)	4m 5s
unit (20)	4m 35s
integration (20, npm run test:client-integration)	2m 17s
integration (20, npm run test:emulator)	3m 2s
integration-windows (20, npm run test:hosting)	10m 17s
integration (20, npm run test:extensions-emulator)	2m 37s
integration-windows (20, npm run test:client-integration)	6m 16s
integration (20, npm run test:frameworks)	3m 55s
integration-windows (20, npm run test:emulator)	7m 57s
integration (20, npm run test:functions-discover)	3m 3s
integration-windows (20, npm run test:functions-discover)	9m 38s
integration (20, npm run test:hosting)	2m 39s
integration-windows (20, npm run test:triggers-end-to-end:inspect)	10m 27s
integration (20, npm run test:import-export)	3m 26s
integration-windows (20, npm run test:storage-deploy)	7m 1s
integration (20, npm run test:storage-deploy)	1m 55s
integration (20, npm run test:storage-emulator-integration)	4m 42s
integration (20, npm run test:triggers-end-to-end)	5m 3s
integration (20, npm run test:triggers-end-to-end:inspect)	2m 39s
	1h 37m 40s

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