Fix shader params system on macOS

[iche033]

🦟 Bug fix

Summary

Loading the shader_param.sdf example world file currently crashes on macOS as it tries to compile glsl shaders before the metal shaders. This PR checks the current rendering API and only try to load the correct shader type.

to test, launch shader_param.sdf world on macOS and it should no longer crash

# in one terminal
gz sim -s -v 4 shader_param.sdf

# in another terminal
gz sim -v 4  -g

Checklist

• Signed all commits for DCO
• Added tests
• 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 #1713 (4c1200d) into gz-sim7 (22b7852) will increase coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           gz-sim7    #1713      +/-   ##
===========================================
+ Coverage    63.90%   63.93%   +0.02%     
===========================================
  Files          334      334              
  Lines        26344    26333      -11     
===========================================
  Hits         16836    16836              
+ Misses        9508     9497      -11     

Impacted Files	Coverage Δ
python/src/gz/sim/_gz_sim_pybind11.cc	100.00% <0.00%> (+50.00%)	⬆️

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