[9.2.0] Add an implicit _sort_key field to module extension tags (#29484)

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### Description
Replaces the implicit `tag._sort_key` field introduced in
https://github.com/bazelbuild/bazel/pull/27883 with an explicit method
`module_ctx.tag_sort_key(tag)`. The implicit field can unintentionally
break users who are iterating through all available fields using e.g.
`dir(tag)`.Replaces the implicit `tag._sort_key` field introduced in
https://github.com/bazelbuild/bazel/pull/27883 with an explicit method
`module_ctx.tag_sort_key(tag)`. The implicit field can unintentionally
break users who are iterating through all available fields using e.g.
`dir(tag)`.

### Motivation
Fixes https://github.com/bazelbuild/rules_rust/issues/3962Fixes
https://github.com/bazelbuild/rules_rust/issues/3962

### Build API Changes
This does affect the Build API, and is not backwards compatible; but
`tag._sort_key` was introduced earlier on HEAD, and hasn't been
backported to a release branch yet.

### Checklist

- [ ] I have added tests for the new use cases (if any).
- [ ] I have updated the documentation (if applicable).

### Release Notes

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RELNOTES: Added the `module_ctx.tag_sort_key(tag)` method, which returns
an opaque object for the given tag that can be compared to derive the
order in which tags from different classes appear in the MODULE.bazel
file.

Closes https://github.com/bazelbuild/bazel/pull/29343.Closes
https://github.com/bazelbuild/bazel/pull/29343.

PiperOrigin-RevId: 902647373
Change-Id: I177edef56f8946cf88e41ed35cc01403e537857c

Commit
https://github.com/bazelbuild/bazel/commit/a76b2e610b099aca138feb8d0ce231d0db060303
and
https://github.com/bazelbuild/bazel/commit/a39cef7d8171fb39663f541ed03434bd126414dc

---------

Co-authored-by: Fabian Meumertzheim <fabian@meumertzhe.im>
Co-authored-by: Xudong Yang <wyverald@gmail.com>
7 files changed
tree: c728a341ad9308ec8e1db161abe92bb9f9e3b272
  1. .bazelci/
  2. .github/
  3. docs/
  4. examples/
  5. scripts/
  6. site/
  7. src/
  8. third_party/
  9. tools/
  10. .bazelrc
  11. .bazelversion
  12. .gitattributes
  13. .gitignore
  14. AUTHORS
  15. bazel_downloader.cfg
  16. BUILD
  17. CHANGELOG.md
  18. CODE_OF_CONDUCT.md
  19. CODEOWNERS
  20. combine_distfiles.py
  21. combine_distfiles_to_tar.sh
  22. compile.sh
  23. CONTRIBUTING.md
  24. CONTRIBUTORS
  25. distdir.bzl
  26. extensions.bzl
  27. LICENSE
  28. maven_install.json
  29. MODULE.bazel
  30. MODULE.bazel.lock
  31. README.md
  32. repositories.bzl
  33. requirements.txt
  34. SECURITY.md
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