Rename `HTTP_REQUEST_RETRIES` to `ANN_RETRIES` in `vector_store_client`, as it now applies to all vector store nodes, not just HTTP requests. Also, remove an unused test setter function.
Rename `HTTP_REQUEST_RETRIES` to `ANN_RETRIES` in `vector_store_client`, as it now applies to all vector store nodes, not just HTTP requests. Also, remove an unused test setter function.