Skip particle passes in Ogre2DepthCamera if there are no particles in the scene

[iche033]

🦟 Bug fix

Summary

Minor performance optimization to ogre2's depth camera implementation. Similar to #965, I used execution mask to skip rendering the particle passes if there are no particles in the scene. This yields a small speed up, see the time it takes to do 1 render operation (for a 320x240 depth camera) before and after the changes in this PR:

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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[ahcorde]

linters

  /github/workspace/ogre2/src/Ogre2DepthCamera.cc:1067:  Lines should be <= 80 characters long  [whitespace/line_length] [2]
  /github/workspace/ogre2/src/Ogre2DepthCamera.cc:1093:  Lines should be <= 80 characters long  [whitespace/line_length] [2]

[iche033]

linters

  /github/workspace/ogre2/src/Ogre2DepthCamera.cc:1067:  Lines should be <= 80 characters long  [whitespace/line_length] [2]
  /github/workspace/ogre2/src/Ogre2DepthCamera.cc:1093:  Lines should be <= 80 characters long  [whitespace/line_length] [2]

fixed linter errors and tests in e4ac886

[codecov]

Codecov Report

Attention: Patch coverage is 95.12195% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 75.59%. Comparing base (dc9fe05) to head (e4ac886).

Files	Patch %	Lines
ogre2/src/Ogre2DepthCamera.cc	95.12%	2 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##           gz-rendering8     #971       +/-   ##
==================================================
+ Coverage               0   75.59%   +75.59%     
==================================================
  Files                  0      177      +177     
  Lines                  0    16934    +16934     
==================================================
+ Hits                   0    12802    +12802     
- Misses                 0     4132     +4132     

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