Auto merge of #127968 - fmease:upd-jsondocck-directive-style, r=GuillaumeGomez

Update jsondocck directives to follow ui_test-style

Context: Comment chain in #125813.
Follow-up to #126788.
Use the same temporary approach of "double parsing" until we figure out how we want to support compiletest/ui_test directive "add-ons" for child test runners like HtmlDocCk and JsonDocCk.

I didn't touch much of jsondocck because I want to refactor it some other time (for robustness, maintainability and better diagnostics; basically by following a similar design of my WIP HtmlDocCk-next, cc #125780).

r? `@GuillaumeGomez`
tree: c6128f81e8e62eb9bd88e1c4dc9159745ffed5f2
  1. .github/
  2. .reuse/
  3. compiler/
  4. library/
  5. LICENSES/
  6. src/
  7. tests/
  8. .clang-format
  9. .editorconfig
  10. .git-blame-ignore-revs
  11. .gitattributes
  12. .gitignore
  13. .gitmodules
  14. .ignore
  15. .mailmap
  16. Cargo.lock
  17. Cargo.toml
  18. CODE_OF_CONDUCT.md
  19. config.example.toml
  20. configure
  21. CONTRIBUTING.md
  22. COPYRIGHT
  23. INSTALL.md
  24. LICENSE-APACHE
  25. LICENSE-MIT
  26. README.md
  27. RELEASES.md
  28. rust-bors.toml
  29. rustfmt.toml
  30. triagebot.toml
  31. x
  32. x.ps1
  33. x.py
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