Set cameraPassCountPerGpuFlush to 6

[iche033]

Signed-off-by: Ian Chen ichen@osrfoundation.org

🦟 Bug fix

Summary

The API was added in gazebosim/gz-rendering#353 to optimize performance and also affects particle effects. It is set in ign-gazebo's Scene3D plugin:
https://github.com/ignitionrobotics/ign-gazebo/blob/39a0ce3712580e855838cf7557013a262d42e1a1/src/gui/plugins/scene3d/Scene3D.cc#L2126

looks like we missed it when porting it over to ign-gui's minimal scene 3d plugin.

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

Merging #381 (1363ad9) into ign-gui6 (9b0cd1f) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##           ign-gui6     #381   +/-   ##
=========================================
  Coverage     65.53%   65.54%           
=========================================
  Files            39       39           
  Lines          5142     5143    +1     
=========================================
+ Hits           3370     3371    +1     
  Misses         1772     1772           

Impacted Files	Coverage Δ
src/plugins/minimal_scene/MinimalScene.cc	64.10% <100.00%> (+0.06%)	⬆️

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