Cleanup resources in CameraSensor destructor

[iche033]

🦟 Bug fix

Summary

Add a call to make sure we destroy the rendering camera object in destructor

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

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (gz-sensors7@e19d8c2). Click here to learn what that means.
The diff coverage is 100.00%.

❗ Current head 8adcd18 differs from pull request most recent head d96d7ac. Consider uploading reports for the commit d96d7ac to get more accurate results

@@              Coverage Diff               @@
##             gz-sensors7     #340   +/-   ##
==============================================
  Coverage               ?   70.02%           
==============================================
  Files                  ?       36           
  Lines                  ?     3926           
  Branches               ?        0           
==============================================
  Hits                   ?     2749           
  Misses                 ?     1177           
  Partials               ?        0           

Impacted Files	Coverage Δ
src/CameraSensor.cc	80.68% <100.00%> (ø)

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