Use different packages for launch and config packages in generate_demo_launch

[forrest-rm]

Description

When generating demo launch, allow for separate launch and config packages. If launch_package_path is not provided, default to moveit_config.package_path as previously done.

This removes the need to have identical duplicate launch files when testing multiple robots.

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 (1fb4041) 50.91% compared to head (5390d89) 50.90%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2647      +/-   ##
==========================================
- Coverage   50.91%   50.90%   -0.01%     
==========================================
  Files         387      387              
  Lines       32430    32430              
==========================================
- Hits        16508    16504       -4     
- Misses      15922    15926       +4     

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[sjahr]

Thank you!

[forrest-rm]

@sjahr, would it be possible to back port this to the humble release branch as well. I originally tested it there.

[sjahr]

@sjahr, would it be possible to back port this to the humble release branch as well. I originally tested it there.

Since it does not break the API yes 👍 I've added the backport lable