This PR removes the `@nrwl/*` packages. Also cleans up references to the
legacy packages.
NOTE: The rescope page is now under `/deprecated/rescope`. There is
still >1000K monthly traffic to it, which might be due to older Nx
users.
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## Current Behavior
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## Expected Behavior
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## Related Issue(s)
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merged. -->
Fixes #
* feat(devkit): split create-empty-tree to different functions
* chore(repo): apply migration for createEmptyTree
* cleanup(misc): fix tests that migration misses
