Do not validate input-only settings in transitions

Starlark transition logic temporarily explicitly sets all input build
settings of a transition to their defaults. Since #13971, these values
are cleared after the transition. However, since then they have also
been subject to type validation, which is not only unnecessary, but
also breaks in the special case of a string build setting with
allow_multiple.

With this commit, input-only build settings are unconditionally
stripped from the post-transition BuildOptions and do not undergo
validation. This is made possible by a refactoring of
`StarlarkTransition#validate` that extracts the validation logic into a
separate function and also improves some variable names.

Fixes #14894

Closes #14972.

PiperOrigin-RevId: 434589143
2 files changed
tree: 142f5f7497f94b4c0a399c7bd43e4e966a124a7e
  1. .bazelci/
  2. .github/
  3. examples/
  4. scripts/
  5. site/
  6. src/
  7. third_party/
  8. tools/
  9. .bazelrc
  10. .gitattributes
  11. .gitignore
  12. AUTHORS
  13. BUILD
  14. CHANGELOG.md
  15. CODE_OF_CONDUCT.md
  16. CODEBASE.md
  17. CODEOWNERS
  18. combine_distfiles.py
  19. combine_distfiles_to_tar.sh
  20. compile.sh
  21. CONTRIBUTING.md
  22. CONTRIBUTORS
  23. distdir.bzl
  24. distdir_deps.bzl
  25. ISSUE_TEMPLATE.md
  26. LICENSE
  27. MODULE.bazel
  28. README.md
  29. SECURITY.md
  30. WORKSPACE
  31. WORKSPACE.bzlmod
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