[mlir][vector] Categorize Vector-to-LLVM conversion tests (nfc) (#125918)

Following https://github.com/llvm/llvm-project/issues/124308, this patch
reorganizes the `vector-to-llvm.mlir` tests by splitting them into two
categories:

- **Basic conversion tests**: Tests that only require
  `populateVectorToLLVMConversionPatterns`, focusing on the minimal
  conversion from Vector to LLVM. These have been moved to
  `vector-to-llvm-interface.mlir`.
- **Full pass tests**: Tests that require the complete
  `ConvertVectorToLLVMPass`, which includes
  `populateVectorToLLVMConversionPatterns` along with additional
  patterns. These remain in `vector-to-llvm.mlir`.

This reorganization clarifies test coverage and helps avoid unnecessary
duplication.

NOTE: This is merely moving tests around between two files and adds
some comments.
2 files changed
tree: abc46ed330f2772933ec058ce76a80d466a8f317
  1. .ci/
  2. .github/
  3. bolt/
  4. clang/
  5. clang-tools-extra/
  6. cmake/
  7. compiler-rt/
  8. cross-project-tests/
  9. flang/
  10. libc/
  11. libclc/
  12. libcxx/
  13. libcxxabi/
  14. libunwind/
  15. lld/
  16. lldb/
  17. llvm/
  18. llvm-libgcc/
  19. mlir/
  20. offload/
  21. openmp/
  22. polly/
  23. pstl/
  24. runtimes/
  25. third-party/
  26. utils/
  27. .clang-format
  28. .clang-tidy
  29. .git-blame-ignore-revs
  30. .gitattributes
  31. .gitignore
  32. .mailmap
  33. CODE_OF_CONDUCT.md
  34. CONTRIBUTING.md
  35. LICENSE.TXT
  36. pyproject.toml
  37. README.md
  38. SECURITY.md
README.md

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