Disable GPU lidar tests on macOS

[iche033]

🦟 Bug fix

related to #157

Summary

gpu_lidar_sensor integration tests started failing after we switched the default render engine to ogre 1.x. Disabling them for now to get green homebew CI builds.

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

[codecov]

Codecov Report

Merging #163 (67675c4) into ign-sensors6 (b0c61c5) will not change coverage.
The diff coverage is n/a.

@@              Coverage Diff              @@
##           ign-sensors6     #163   +/-   ##
=============================================
  Coverage         75.90%   75.90%           
=============================================
  Files                27       27           
  Lines              2747     2747           
=============================================
  Hits               2085     2085           
  Misses              662      662           

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