[App Extensibility] Remove `retail-react-app-demo` preset in CI (@W-17597153@) #7631

Job	Run time
changelog-check	17s
generated (retail-react-app-test-project)	5m 56s
lighthouse (20)	14m 21s
pwa-kit (16, 8)	13m 59s
generated-windows (retail-react-app-test-project)	7m 7s
generated (express-minimal-test-project)	4m 5s
pwa-kit (16, 9)	12m 33s
generated-windows (express-minimal-test-project)	5m 51s
generated (typescript-minimal-test-project)	4m 7s
pwa-kit (18, 8)	12m 4s
generated-windows (typescript-minimal-test-project)	5m 57s
pwa-kit-windows (16, 8)	15m 48s
pwa-kit (18, 9)	11m 47s
pwa-kit-windows (16, 9)	14m 59s
pwa-kit (18, 10)	12m 42s
pwa-kit-windows (18, 8)	14m 7s
pwa-kit (20, 8)	10m 52s
pwa-kit-windows (18, 9)	15m 8s
pwa-kit (20, 9)	10m 13s
pwa-kit-windows (18, 10)	14m 47s
pwa-kit (20, 10)	11m 25s
pwa-kit-windows (20, 8)	13m 8s
pwa-kit-windows (20, 9)	13m 41s
pwa-kit-windows (20, 10)	12m 52s
	4h 17m 46s

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