Replace plotIcon in ComponentInspector with GzPlotIcon

[AzulRadio]

New feature

Summary

As title. The behavior should be exactly the same as before. Replace for Light.qml Physics.qml and SphericalCoordinates.qml.

All replacements for plotIcon in component Inspector should go into this PR.

Test it

For SphericalCoordinates testing:

ign gazebo . -v 4 ./spherical_coordinates.sdf --render-engine ogre

For Light testing:

ign gazebo . -v 4 ./lights.sdf --render-engine ogre

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• 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 #1638 (739b801) into ign-gazebo6 (8c9489d) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           ign-gazebo6    #1638      +/-   ##
===============================================
- Coverage        64.40%   64.38%   -0.03%     
===============================================
  Files              320      320              
  Lines            25892    25892              
===============================================
- Hits             16677    16671       -6     
- Misses            9215     9221       +6     

Impacted Files	Coverage Δ
src/SimulationRunner.cc	89.98% <0.00%> (-0.96%)	⬇️

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