(moveit_py) remove unused applyPlanningScene

[MatthijsBurgh]

Description

Removed unused applyPlanningScene function.

Checklist

• Required by CI: Code is auto formatted using clang-format
• Extend the tutorials / documentation reference
• Document API changes relevant to the user in the MIGRATION.md notes
• Create tests, which fail without this PR reference
• Include a screenshot if changing a GUI
• While waiting for someone to review your request, please help review another open pull request to support the maintainers

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (09019d2) 50.32% compared to head (ded77a6) 50.31%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2505      +/-   ##
==========================================
- Coverage   50.32%   50.31%   -0.00%     
==========================================
  Files         391      391              
  Lines       31983    31983              
==========================================
- Hits        16091    16089       -2     
- Misses      15892    15894       +2     

see 2 files with indirect coverage changes

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[peterdavidfagan]

Thanks @MatthijsBurgh .