Refactor: Replace manual debug flags with logger.debug in isobased.py

[trivedikavya]

Description
Currently, WeatherRoutingTool/algorithms/isobased.py uses a manual variable debug = False and if debug: print(...) statements for debugging. This should be replaced with the standard logger.debug() to allow better control over verbosity via configuration.

Proposed Changes

• Remove debug = False local variables.
• Replace if debug: ... blocks with logger.debug(...).

I would like to work on this issue.

[trivedikavya]

Request for Review: Could you please review these changes and provide your feedback? cc: @kdemmich @MartinPontius @MPremasiri @shreyass-ranganatha @jonathanbauer03 @pankaj-bind @TheRGuy9201