Add experimental externals detection #2789

Job	Run time
units / 🧪 Unit Tests	21m 3s
typecheck / typecheck	5m 47s
e2e / 🧪 CLI v3 tests (ubuntu-latest - npm)	2m 15s
e2e / 🧪 CLI v3 tests (ubuntu-latest - pnpm)	2m 12s
e2e / 🧪 CLI v3 tests (windows-latest - npm)	4m 39s
e2e / 🧪 CLI v3 tests (windows-latest - pnpm)	4m 33s
	40m 29s

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