Changes

chore(pingcap/tidb): update Python environment setup in vector search test

This commit modifies the `pull_vector_search_test.groovy` file to enhance the Python environment setup by using a script to install `uv` instead of relying on `pipx`. The changes also ensure that the local bin directory is included in the PATH, streamlining the installation process for test dependencies.
 (commit: eb947f2)