Use ign-rendering's screenToScene functions

[chapulina]

🦟 Bug fix

Summary

Garden is crashing when there are points in the scene, and the user hovers or clicks on the 3D scene.

The changes in this PR fixes the hover, but the clicks are only fixed by

• Fix crash on material switcher when there are points gz-rendering#586

Since the TODO was there since Fortress, I targeted this PR at ign-gui6 and we can merge forward afterwards.

Test it

Load some Gazebo world and select, right-click on models, orbit the scene... The clicks should be in the right place.

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.

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[codecov]

Codecov Report

Merging #372 (c87c5c7) into ign-gui6 (dc268fe) will increase coverage by 0.18%.
The diff coverage is 67.42%.

@@             Coverage Diff              @@
##           ign-gui6     #372      +/-   ##
============================================
+ Coverage     65.40%   65.59%   +0.18%     
============================================
  Files            39       39              
  Lines          5079     5139      +60     
============================================
+ Hits           3322     3371      +49     
- Misses         1757     1768      +11     

Impacted Files	Coverage Δ
src/Application.cc	85.35% <33.33%> (-0.45%)	⬇️
src/plugins/marker_manager/MarkerManager.cc	60.51% <60.71%> (+0.51%)	⬆️
src/plugins/minimal_scene/MinimalScene.cc	64.20% <66.66%> (+1.22%)	⬆️
...s/transport_scene_manager/TransportSceneManager.cc	53.97% <75.75%> (+1.68%)	⬆️
...interactive_view_control/InteractiveViewControl.cc	17.88% <100.00%> (+1.35%)	⬆️

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