load robot_description from other namespace (backport #3269)

[mergify]

Description

Add namespace to the topic to read robot_description

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

---

This is an automatic backport of pull request #3269 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of af6d762 has failed:

On branch mergify/bp/humble/pr-3269
Your branch is up to date with 'origin/humble'.

You are currently cherry-picking commit af6d762ec.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   moveit_ros/planning/rdf_loader/src/synchronized_string_parameter.cpp

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 51.41%. Comparing base (9aefcb8) to head (b612d7e).
Report is 1 commits behind head on humble.

Files with missing lines	Patch %	Lines
...g/rdf_loader/src/synchronized_string_parameter.cpp	0.00%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           humble    #3324      +/-   ##
==========================================
- Coverage   51.42%   51.41%   -0.00%     
==========================================
  Files         382      382              
  Lines       31892    31892              
==========================================
- Hits        16397    16394       -3     
- Misses      15495    15498       +3     

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