Add experimental externals detection #2799

Job	Run time
units / 🧪 Unit Tests	21m 3s
typecheck / typecheck	5m 8s
e2e / 🧪 CLI v3 tests (ubuntu-latest - npm)	2m 14s
e2e / 🧪 CLI v3 tests (ubuntu-latest - pnpm)	2m 10s
e2e / 🧪 CLI v3 tests (windows-latest - npm)	5m 17s
e2e / 🧪 CLI v3 tests (windows-latest - pnpm)	6m 3s
	41m 55s

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