Tracking Issue for deprecating per-build-target `edition` field

[ehuss]

Summary

RFC: #3772

Implementation:

• docs(ref): Note that target-edition is deprecated #15292
• fix(toml): Report '<target>.edition' deprecation to users #15321
• Remove support in next edition

Documentation: https://doc.rust-lang.org/nightly/cargo/reference/cargo-targets.html#the-edition-field

This feature is to deprecate the edition field in the cargo target configuration.

Unresolved Issues

• Should we provide a migration? What would it look like?

Future Extensions

No response

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