Auto merge of #119912 - notriddle:notriddle/reexport-dedup, r=GuillaumeGomez

rustdoc-search: single result for items with multiple paths

Part of #15723

Preview: https://notriddle.com/rustdoc-html-demo-9/reexport-dup/std/index.html?search=hashmap

This change uses the same "exact" paths as trait implementors and type alias inlining to track items with multiple reachable paths. This way, if you search for `vec`, you get only the `std` exports of it, and not the one from `alloc`.

It still includes all the items in the search index so that you can search for them by all available paths. For example, try `core::option` and `std::option`, and notice that the results page doesn't show duplicates, but still shows all the items in their respective crates.
tree: 6ff2feb52920f80ff744c832385c5da2b126581a
  1. .github/
  2. .reuse/
  3. compiler/
  4. library/
  5. LICENSES/
  6. src/
  7. tests/
  8. .editorconfig
  9. .git-blame-ignore-revs
  10. .gitattributes
  11. .gitignore
  12. .gitmodules
  13. .mailmap
  14. Cargo.lock
  15. Cargo.toml
  16. CODE_OF_CONDUCT.md
  17. config.example.toml
  18. configure
  19. CONTRIBUTING.md
  20. COPYRIGHT
  21. INSTALL.md
  22. LICENSE-APACHE
  23. LICENSE-MIT
  24. README.md
  25. RELEASES.md
  26. rust-bors.toml
  27. rustfmt.toml
  28. triagebot.toml
  29. x
  30. x.ps1
  31. x.py
README.md

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