Bzlmod: Starlarkify default attr values for TypeCheckedTags

(https://github.com/bazelbuild/bazel/issues/13316)

Attribute values are stored normally as "native" values (ie. Java types), and we Starlarkify them before exposing them to Starlark. We were, however, not doing it for attribute default values, which means that the Java `null` was not being converted to Starlark `None`, and the Java `ImmutableMap` was not being converted to Starlark `Dict`, etc.

Fixes https://github.com/bazelbuild/bazel/issues/14528.

PiperOrigin-RevId: 421046160
3 files changed
tree: 71bf206f3b4fa9cab3716f618c21ce35e359f034
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .bazelrc
  9. .gitattributes
  10. .gitignore
  11. AUTHORS
  12. BUILD
  13. CHANGELOG.md
  14. CODE_OF_CONDUCT.md
  15. CODEBASE.md
  16. CODEOWNERS
  17. combine_distfiles.py
  18. combine_distfiles_to_tar.sh
  19. compile.sh
  20. CONTRIBUTING.md
  21. CONTRIBUTORS
  22. distdir.bzl
  23. distdir_deps.bzl
  24. ISSUE_TEMPLATE.md
  25. LICENSE
  26. README.md
  27. SECURITY.md
  28. WORKSPACE
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