Remove test script for CCXT implementation

- Deleted `test_ccxt_implementation.py`, which was used for troubleshooting and testing the exchange data retrieval functionality in the delist recommender.
- The script included various utility functions and asynchronous tests for market data retrieval, but it is no longer needed in the codebase.
- This cleanup helps streamline the project by removing unused code and reducing maintenance overhead.

Author: goldhaxx