Add experimental externals detection #2802

Job	Run time
typecheck / typecheck	4m 59s
units / 🧪 Unit Tests	21m 11s
e2e / 🧪 CLI v3 tests (ubuntu-latest - npm)	2m 25s
e2e / 🧪 CLI v3 tests (ubuntu-latest - pnpm)	2m 17s
e2e / 🧪 CLI v3 tests (windows-latest - npm)	5m 15s
e2e / 🧪 CLI v3 tests (windows-latest - pnpm)	5m 33s
	41m 40s

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