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4aeb297064
This PR reverts RUST-147622 for several reasons: 1. The RUST-147622 PR would format the generated core library code using an arbitrary `rustfmt` picked up from `PATH`, which will cause hard-to-debug failures when the `rustfmt` used to format the generated unicode data code versus the `rustfmt` used to format the in-tree library code. 2. Previously, the `unicode-table-generator` tests were not run under CI as part of `coretests`, and since for `x86_64-gnu-aux` job we run library `coretests` with `miri`, the generated tests unfortunately caused an unacceptably large Merge CI time regression from ~2 hours to ~3.5 hours, making it the slowest Merge CI job (and thus the new bottleneck). 3. This PR also has an unintended effect of causing a diagnostic regression (RUST-148387), though that's mostly an edge case not properly handled by `rustc` diagnostics. Given that these are three distinct causes with non-trivial fixes, I'm proposing to revert this PR to return us to baseline. This is not prejudice against relanding the changes with these issues addressed, but to alleviate time pressure to address these non-trivial issues.