Make `Label#toString` return `@@`-prefixed labels

This change causes all labels in error messages, log output, Build Event Protocol, etc. to be prefixed with double-at (`@@`) if they are from non-main repos. This prevents cases where messages contain stuff like `the target @abc~1.0//:def is wrong` but the user can't do `bazel query @abc~1.0//:def` at all, since the actual target is `@@abc~1.0//:def`.

This required more test changes than expected as there have been many places in the codebase where we compare labels using some sort of string form (for example, toolchain types as automatic exec groups).

Fixes https://github.com/bazelbuild/bazel/issues/18543.

RELNOTES[INC]: All labels in Bazel error messages, log output, Build Event Protocol, etc. are now prefixed with double-at (`@@`) instead of single-at (`@`) where applicable, to properly denote that they contain canonical repo names.

PiperOrigin-RevId: 581287175
Change-Id: I1261ab14067bcf5d44cd140e5528b5da5916dc87
68 files changed
tree: b993f628e71f6c6e4f61fb792f1ad7cd3258ddca
  1. .bazelci/
  2. .github/
  3. examples/
  4. scripts/
  5. site/
  6. src/
  7. third_party/
  8. tools/
  9. .bazelrc
  10. .bazelversion
  11. .gitattributes
  12. .gitignore
  13. AUTHORS
  14. bazel_downloader.cfg
  15. BUILD
  16. CHANGELOG.md
  17. CODE_OF_CONDUCT.md
  18. CODEOWNERS
  19. combine_distfiles.py
  20. combine_distfiles_to_tar.sh
  21. compile.sh
  22. CONTRIBUTING.md
  23. CONTRIBUTORS
  24. distdir.bzl
  25. extensions.bzl
  26. LICENSE
  27. maven_install.json
  28. MODULE.bazel
  29. MODULE.bazel.lock
  30. rbe_extension.bzl
  31. README.md
  32. repositories.bzl
  33. requirements.txt
  34. SECURITY.md
  35. WORKSPACE
  36. WORKSPACE.bzlmod
  37. workspace_deps.bzl
README.md

Bazel

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