feat(mfe): enable proxy for no turbo json

[chris-olszewski]

Description

This PR adds the MFE support for repositories that do not contain a turbo.json. All this boils down to is:

• Slight refactor for constructing MFE configs to allow for us to test this without hitting disk
• Going down the "no turbo.json" codepath even if not explicitly enabled as long as MFE configs are present
• Update generated turbo.json with proxy tasks injected

Testing Instructions

Added unit test for sans-turbo.json, but containing a MFE config.

Manual test on a MFE test repo w/o a turbo.json

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
examples-nonmonorepo	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 4, 2024 4:31pm

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[tknickman]

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