Clear scene before exiting wide_angle_camera_test

[iche033]

🦟 Bug fix

This fixes the INTEGRATION_wide_angle_camera test for me locally on macOS. For some reason, we have to remove the sensor and scene visuals manually in this test otherwise it segfaults on macOS while cleaning up shared pointers. This does not happen on Ubuntu.

Related PR: gazebosim/gz-rendering#718

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)
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[codecov]

Codecov Report

Merging #266 (bd77525) into gz-sensors7 (86b42a2) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           gz-sensors7     #266   +/-   ##
============================================
  Coverage        67.75%   67.75%           
============================================
  Files               35       35           
  Lines             3734     3734           
============================================
  Hits              2530     2530           
  Misses            1204     1204           

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