fix: improve Python detection in manylinux environment

- Modify faiss CMakeLists.txt to try both FindPython and FindPython3
- Add scikit-build configuration to help with Python detection
- Simplify Linux environment variables in cibuildwheel
- Add CMake Python detection before faiss configuration

packages/leann-backend-hnsw/pyproject.toml

@@ -24,4 +24,5 @@ cmake.verbose = true
 
 # CMake definitions to optimize compilation
 [tool.scikit-build.cmake.define]
-CMAKE_BUILD_PARALLEL_LEVEL = "8"
+CMAKE_BUILD_PARALLEL_LEVEL = "8"
+SKBUILD_SOABI = "YES"