Flexibility in moveit_configs_utils reading of .setup_assistant

[DLu]

Description

Fix bug described in #1254 (review)

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

[vatanaksoytezer]

Just tested, and fixes the said error. I think still we won't be able to launch anything before controllers.yaml files are generated though (at least moveit_configs_utils seems upset about it)

[codecov]

Codecov Report

Merging #1264 (2fbee6b) into main (6c690db) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1264   +/-   ##
=======================================
  Coverage   61.44%   61.44%           
=======================================
  Files         274      274           
  Lines       24936    24936           
=======================================
  Hits        15319    15319           
  Misses       9617     9617           

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[DLu]

That sounds like it needs a separate issue.