Rollup merge of #158343 - obi1kenobi:pg/item-const-stability, r=GuillaumeGomez

Include `Item::const_stability` info in rustdoc JSON.

Include a parallel `Item::const_stability` item in rustdoc JSON, sibling to `Item::stability` from rust-lang/rust#158230, intended for the same purpose of catching accidental breaking changes in the Rust standard library.

I aimed to include `Item::const_stability` judiciously, when it would be genuinely useful without needlessly bloating the JSON. For example, if an item is already unstable, we do not duplicate the `Item::stability` value into `Item::const_stability` as the const-instability is clearly implied. I've covered all such cases in the test suite and documented my reasoning inline.

r? @GuillaumeGomez

**AI disclosure:** This PR is the product of a combination of manual work and AI tools. I secured approval in advance from the designated reviewer. I stand behind the quality of the code I'm submitting, and I vouch it's as good or better compared to if I had written every line by my own hand.

(In particular, local AI review flagged several missing test cases, one of which caught a bug I would have missed otherwise.)
tree: 847f68cdad955e25a27535ea6cde9fe264909a0e
  1. .github/
  2. compiler/
  3. library/
  4. LICENSES/
  5. src/
  6. tests/
  7. .clang-format
  8. .editorconfig
  9. .git-blame-ignore-revs
  10. .gitattributes
  11. .gitignore
  12. .gitmodules
  13. .ignore
  14. .mailmap
  15. bootstrap.example.toml
  16. Cargo.lock
  17. Cargo.toml
  18. CODE_OF_CONDUCT.md
  19. configure
  20. CONTRIBUTING.md
  21. COPYRIGHT
  22. INSTALL.md
  23. LICENSE-APACHE
  24. license-metadata.json
  25. LICENSE-MIT
  26. package.json
  27. README.md
  28. RELEASES.md
  29. REUSE.toml
  30. rust-bors.toml
  31. rustfmt.toml
  32. triagebot.toml
  33. typos.toml
  34. x
  35. x.ps1
  36. x.py
  37. yarn.lock
README.md

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