Add Windows build. #27043

Job	Run time
unit (18)	4m 4s
check-package-lock (20)	13s
unit (20)	4m 34s
check-package-lock-vsce (20)	11s
check-json-schema (20)	1m 45s
lint	0s
integration-windows (20, npm run test:hosting)	11m 2s
integration (20, npm run test:client-integration)	2m 24s
integration-windows (20, npm run test:client-integration)	5m 48s
integration (20, npm run test:emulator)	2m 52s
integration-windows (20, npm run test:emulator)	6m 41s
integration (20, npm run test:extensions-emulator)	2m 47s
integration-windows (20, npm run test:functions-discover)	9m 13s
integration (20, npm run test:frameworks)	3m 52s
integration-windows (20, npm run test:triggers-end-to-end:inspect)	8m 37s
integration-windows (20, npm run test:storage-deploy)	7m 34s
integration (20, npm run test:functions-discover)	3m 14s
integration (20, npm run test:hosting)	2m 32s
integration (20, npm run test:import-export)	3m 26s
integration (20, npm run test:storage-deploy)	1m 54s
integration (20, npm run test:storage-emulator-integration)	4m 11s
integration (20, npm run test:triggers-end-to-end)	5m 10s
integration (20, npm run test:triggers-end-to-end:inspect)	2m 42s
	1h 34m 46s

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