fix: replace print statements with logging in repo_load_controller.py

[MoralCode]

Ported from the original (augurlabs/augur#3567) filed by @ANJAN672

Description

Replace print statements with proper logging in repo_load_controller.py

Supports #114

Changes

• Replace 15 print() calls with appropriate logger methods
• Uses logger.debug(), logger.info(), logger.warning(), and logger.error() based on context

Testing

• Verified syntax with python3 -m py_compile
• Logger is already defined in the file (line 18)