Use MinimalScene by default

[chapulina]

🎉 New feature

Part of gazebosim/gz-gui#137

Summary

Ideally we'd deprecate GzScene3D on Fortress so we stop maintaining 2 scenes. For that to happen, we need to achieve feature parity with MinimalScene. We need the following, and maybe more:

• Make Video recorder plugin work with MinimalScene #900
• Added Spawn plugin #983
• Added VisualizationCapabilities plugin #988

It would also be good to get this in, so it's easier to configure the GUI and users don't have to repeat lots of plugins for the 3D scene: Going without it for now

• Config file loading options #1012

Test it

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• 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

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[jennuine]

LGTM 🎉 with some minor nits

[codecov]

Codecov Report

Merging #1014 (55d9790) into main (4be711c) will increase coverage by 0.13%.
The diff coverage is 27.58%.

@@            Coverage Diff             @@
##             main    #1014      +/-   ##
==========================================
+ Coverage   63.47%   63.60%   +0.13%     
==========================================
  Files         241      251      +10     
  Lines       19577    19614      +37     
==========================================
+ Hits        12426    12476      +50     
+ Misses       7151     7138      -13     

Impacted Files	Coverage Δ
src/gui/plugins/spawn/Spawn.hh	100.00% <ø> (ø)
src/gui/plugins/spawn/Spawn.cc	10.30% <6.38%> (ø)
...ins/entity_context_menu/EntityContextMenuPlugin.cc	41.17% <41.17%> (ø)
...ins/entity_context_menu/EntityContextMenuPlugin.hh	100.00% <100.00%> (ø)
src/rendering/RenderUtil.cc	35.86% <0.00%> (-0.64%)	⬇️
src/ign.cc	71.89% <0.00%> (-0.48%)	⬇️
.../gui/plugins/transform_control/TransformControl.cc	6.97% <0.00%> (-0.26%)	⬇️
include/ignition/gazebo/gui/GuiEvents.hh	0.00% <0.00%> (ø)
src/gui/plugins/scene3d/Scene3D.hh
src/gui/plugins/scene_manager/GzSceneManager.hh	100.00% <0.00%> (ø)
... and 12 more

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