Embed @platforms into the Bazel binary

This PR implements the change discussed at https://docs.google.com/document/d/1EArrWYUDugqJzBcb0-OxY5BH1FFPYV3jxLIXbJpD9RY/edit?pli=1#heading=h.5mcn15i0e1ch.

Closes https://github.com/bazelbuild/bazel/pull/8600.
https://github.com/bazelbuild/bazel/issues/6516

This is encore of https://github.com/bazelbuild/bazel/commit/324dc44e6bafb487331724ae83d67bc18ed8a8aa with these changes:

* removing WORKSPACE file from the platforms_archive - repository rules always create new WORKSPACE file and that messes up the timestamps after re-archiving. This fixes the determinism test.
* after @aehlig kindly explained the semantics of external repositories, I discovered that overriding @platforms doesn't work when there is a load statement somewhere above the override, which is the common case. Therefore I had to move bundled platforms to the workspace suffix and had to use maybe pattern.
* because of maybe pattern I have to mock the bzl file in Bazel unit tests.

RELNOTES:
PiperOrigin-RevId: 253193463
15 files changed
tree: f4454702a73d4bc4b3f57a7cbc035ecf38ae096f
  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. CODEOWNERS
  15. combine_distfiles.py
  16. combine_distfiles_to_tar.sh
  17. compile.sh
  18. CONTRIBUTING.md
  19. CONTRIBUTORS
  20. distdir.bzl
  21. ISSUE_TEMPLATE.md
  22. LICENSE
  23. README.md
  24. WORKSPACE
README.md

Bazel

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