[feature] Rename V4 `app` dir to => `src` @W-18895152@ #10762

Job	Run time
changelog-check	26s
generated-windows (typescript-minimal-test-project)	5m 43s
generated-windows (express-minimal-test-project)	5m 18s
generated-windows (retail-react-app-test-project)	5m 35s
bundle-sizes	3m 1s
generated (retail-react-app-test-project)	2m 33s
generated (typescript-minimal-test-project)	2m 30s
pwa-kit-windows (18, 8)	24m 6s
pwa-kit-windows (18, 9)	23m 38s
generated (express-minimal-test-project)	2m 17s
pwa-kit-windows (18, 10)	27m 1s
pwa-kit-windows (20, 8)	22m 54s
pwa-kit-windows (20, 11)	22m 44s
pwa-kit-windows (22, 8)	21m 26s
pwa-kit-windows (22, 9)	22m 35s
pwa-kit-windows (20, 9)	22m 28s
pwa-kit-windows (22, 10)	24m 22s
pwa-kit-windows (20, 10)	26m 9s
pwa-kit (18, 10)	19m 0s
pwa-kit (20, 8)	15m 32s
pwa-kit (18, 8)	17m 12s
pwa-kit (18, 9)	16m 37s
pwa-kit-windows (22, 11)	22m 55s
pwa-kit (22, 8)	14m 30s
pwa-kit (20, 11)	15m 42s
pwa-kit (22, 9)	14m 48s
pwa-kit (20, 10)	17m 19s
pwa-kit (22, 11)	14m 15s
pwa-kit (22, 10)	16m 25s
pwa-kit (20, 9)	15m 42s
	7h 44m 43s

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