Support Starlark exec transitions for all code paths.

Before this change, production code supported `--experimental_starlark_exec`. But some test code and `BaselineOptionsFunction` didn't. This change opts them in too.

### Details:

- `AnalysisTestUtil` has an exec config getter that completely ignores the Starlark transition: when it sets up `ExecutionTransitionFactory`'s `AttributeTransitionData`, it omits the `analysisData` setter that injects the Starlark transition.
- I added that setter. But since this isn't a Skyfunction, I had to refactor the transition loading logic. I moved it to a dedicated class (`StarlarkExecTransitionLoader`) and added access points for all relevant callers.
- `StarlarkExecTransitionLoader` is just a copy of what was previously in `DependencyResolver`.

PiperOrigin-RevId: 575831770
Change-Id: I16889d111e4a1c0304629c4de870cdee1976a4c5
16 files changed
tree: c634b656354d90b41e83b17702e7fbd23809336f
  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. distdir_deps.bzl
  26. extensions.bzl
  27. LICENSE
  28. maven_install.json
  29. MODULE.bazel
  30. MODULE.bazel.lock
  31. rbe_extension.bzl
  32. README.md
  33. repositories.bzl
  34. requirements.txt
  35. SECURITY.md
  36. WORKSPACE
  37. WORKSPACE.bzlmod
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