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).

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 44.15%. Comparing base (4a4d1c1) to head (b55d858).
Report is 1 commits behind head on jazzy.

Files with missing lines	Patch %	Lines
...g/rdf_loader/src/synchronized_string_parameter.cpp	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##            jazzy    #3325      +/-   ##
==========================================
- Coverage   44.15%   44.15%   -0.00%     
==========================================
  Files         700      700              
  Lines       61683    61682       -1     
  Branches     7477     7477              
==========================================
- Hits        27230    27228       -2     
+ Misses      34286    34285       -1     
- Partials      167      169       +2     

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