Changes

chore(pingcap/tidb): enhance vector search test caching and add tiup v8.5.1 support (#3540)

This commit updates the `pull_vector_search_test.groovy` file to improve
the caching mechanism for test assets by specifying distinct cache keys
for Euclidean HDF5 files and TiUP v8.5.1 components.
It introduces a new directory for downloading and caching TiUP
components, ensuring that the installation only occurs on cache misses.
Additionally, it includes commands to verify the installation of TiUP
components during the test execution, enhancing the overall setup
process.
 (commit: 2a66448)