pantsbuild / pants / 26660759349

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Move Buf subsystem out of the lint subpackage (#23382)

## Summary

Hoists `subsystem.py` and `skip_field.py` from
`src/python/pants/backend/codegen/protobuf/lint/buf/` up to
`src/python/pants/backend/codegen/protobuf/buf/` so non-lint consumers
can depend on the `BufSubsystem` without reaching into the lint package.

Pure file relocation — `git mv` of two files plus import-path updates in
the three files that referenced them. No behavior change.

This is split out from #23343 (which adds Buf as an alternate Python
protobuf code generator) to make that PR easier to review by separating
the mechanical move from the substantive new code. Once this lands,
#23343 will be rebased onto it and reduce to just the codegen feature.

## Test plan

- [ ] `./pants test
src/python/pants/backend/codegen/protobuf/lint/buf::` still passes
(lint/format rules import from new path).
- [ ] CI passes.

4 of 6 new or added lines in 3 files covered. (66.67%)

93069 of 100299 relevant lines covered (92.79%)

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