handle continuous joints in getLowerAndUpperLimits (backport #3153)

[mergify]

Description

The RevoluteJointModel returns -pi/pi as position joint limits for continuous joints, which are not position bounded.
This PR fixes getLowerAndUpperLimits to check the position_bounded_ flag and return joint limits accordingly.

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 #3153 done by [Mergify](https://mergify.com).

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Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 44.45%. Comparing base (be68635) to head (bd1a13f).
Report is 1 commits behind head on jazzy.

Files with missing lines	Patch %	Lines
moveit_core/robot_model/src/joint_model_group.cpp	0.00%	4 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##            jazzy    #3155      +/-   ##
==========================================
- Coverage   46.13%   44.45%   -1.67%     
==========================================
  Files         483      698     +215     
  Lines       40631    61558   +20927     
  Branches        0     7459    +7459     
==========================================
+ Hits        18740    27359    +8619     
- Misses      21891    34030   +12139     
- Partials        0      169     +169     

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