Remove urlpath dependency and update relative path logic

[Ariana-B]

• Remove broken urlpath dependency as per ODC Tools Broken on Python 3.12 - broken urlpath dependency #588
• Change relative path logic to be consistent across tools and be default behaviour

[codecov]

Codecov Report

Attention: Patch coverage is 96.96970% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 76.68%. Comparing base (391c190) to head (dfca9fd).

Files	Patch %	Lines
apps/dc_tools/odc/apps/dc_tools/stac_api_to_dc.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #602      +/-   ##
===========================================
- Coverage    76.71%   76.68%   -0.04%     
===========================================
  Files           41       41              
  Lines         2998     2959      -39     
===========================================
- Hits          2300     2269      -31     
+ Misses         698      690       -8     

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