Revert "unicode_data refactors RUST-147622"

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.