feat(repair): add migration to remove unused "lerna" field from lerna.json

[JamesHenry]

In a very old lerna.json config I discovered this:

{
  "lerna": "2.0.0-rc.5",
  "packages": [
    "packages/*"
  ],
  "version": "0.0.0"
}

We do not do anything with a "lerna" field in lerna.json so this migration removes it if it is present

[nx-cloud]

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