[feature] Rename V4 `app` dir to => `src` @W-18895152@ #10758

Job	Run time
changelog-check	24s
generated (retail-react-app-test-project)	2m 52s
generated (typescript-minimal-test-project)	2m 31s
generated (express-minimal-test-project)	2m 32s
pwa-kit-windows (20, 9)	4m 59s
generated-windows (typescript-minimal-test-project)	4m 46s
pwa-kit-windows (18, 9)	5m 18s
pwa-kit-windows (20, 11)	4m 44s
pwa-kit-windows (18, 8)	5m 29s
generated-windows (retail-react-app-test-project)	4m 50s
pwa-kit-windows (20, 8)	4m 54s
pwa-kit (18, 9)	3m 19s
pwa-kit (20, 8)	3m 7s
generated-windows (express-minimal-test-project)	4m 24s
pwa-kit-windows (22, 11)	4m 43s
pwa-kit-windows (22, 9)	4m 57s
pwa-kit (18, 8)	3m 21s
pwa-kit (22, 8)	3m 5s
pwa-kit-windows (18, 10)	7m 36s
pwa-kit-windows (20, 10)	7m 22s
pwa-kit-windows (22, 8)	4m 48s
pwa-kit (20, 10)	4m 39s
pwa-kit (20, 9)	3m 3s
pwa-kit (18, 10)	5m 9s
pwa-kit (20, 11)	3m 2s
bundle-sizes	3m 13s
pwa-kit (22, 10)	4m 36s
pwa-kit-windows (22, 10)	8m 29s
pwa-kit (22, 9)	2m 59s
pwa-kit (22, 11)	2m 52s
	2h 8m 3s

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