explain why to update instance & make create database optional #26743

Job	Run time
unit (18)	3m 55s
unit (20)	4m 25s
check-package-lock-vsce (20)	9s
check-json-schema (20)	1m 36s
check-package-lock (20)	12s
lint	0s
integration-windows (20, npm run test:hosting)	9m 35s
integration (20, npm run test:client-integration)	2m 20s
integration-windows (20, npm run test:client-integration)	7m 2s
integration (20, npm run test:emulator)	3m 0s
integration-windows (20, npm run test:emulator)	7m 6s
integration (20, npm run test:extensions-emulator)	2m 33s
integration (20, npm run test:frameworks)	3m 59s
integration-windows (20, npm run test:functions-discover)	10m 25s
integration (20, npm run test:functions-discover)	3m 2s
integration (20, npm run test:hosting)	2m 43s
integration-windows (20, npm run test:triggers-end-to-end:inspect)	7m 12s
integration (20, npm run test:import-export)	3m 35s
integration-windows (20, npm run test:storage-deploy)	9m 23s
integration (20, npm run test:storage-deploy)	2m 4s
integration (20, npm run test:storage-emulator-integration)	4m 17s
integration (20, npm run test:triggers-end-to-end)	5m 4s
integration (20, npm run test:triggers-end-to-end:inspect)	2m 50s
	1h 36m 27s

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