Cleanup incoming configuration transitions on Starlark rules

Remove PatchTransition and TransitionFactory. Those don't seem to be possible inputs in Starlark, because they don't implement StarlarkValue, with exception of ExecTransitionFactory. Using exec as an incoming transition seems like a really weird use case, and it's probably better not to support it, than making Bazel code more complex.

There seem to be no uses of exec incoming transition on github: https://github.com/search?q=%22cfg+%3D+config%22+language%3AStarlark&type=repositories&ref=advsearch

Remove RuleClass.cfg(PatchTransition). It was only used in tests. Inline the uses.
Add Nullable to RuleClass.transitionFactory.

This is preparation to support cfg on extended rules.

RELNOTES[INC]: Incoming transitions on rules can't be set to "exec" transition.

PiperOrigin-RevId: 582969396
Change-Id: I1e6391d17671fdfa60e1945561396107172c6a4a
7 files changed
tree: 5dc001e9af657f6104ab81a63673babd7f776393
  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
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