feat(turborepo): Error Improvements & Documentation (#7033)
### Description
Converted more errors to be high quality. Specifically, I added
diagnostic codes, more coherent messages and code snippets when
possible. Also added documentation for these errors on the turbo site.
### Testing Instructions
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Closes TURBO-2069
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Co-authored-by: Anthony Shew <anthony.shew@vercel.com>
