Optimization: remove extra copy of data buffer in Ogre2GpuRays and Ogre2DepthCamera

[iche033]

🦟 Bug fix

Summary

In Ogre2GpuRays and Ogre2DepthCamera, the raw data from ogre2 is copied into an local intermediate data buffer first before being copied again to separate outgoing data buffer(s) which are to be consumed by gz-sensors. This is not really necessary because gz-sensors also does its own copy when new data are available. This PR removes the local intermediate data buffer in Ogre2GpuRays and Ogre2DepthCamera classes and just copy the ogre2 raw data directly to the outgoing buffer

Tested by running relevant integration tests:

• gz-rendering: INTEGRATION_gpu_rays, INTEGRATION_depth_camera tests
  • e.g. GZ_ENGINE_TO_TEST=ogre2 ./build/gz-rendering8/bin/INTEGRATION_depth_camera
• gz-sensors: INTEGRATION_gpu_lidar_sensor, INTEGRATION_rgbd_camera, INTEGRATION_depth_camera

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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