Remove redundant image_proc nodes in realsense pipeline

[r2avula]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

Fix/cleanup

• What is the current behavior? (You can also link to an open issue here)

There are debayer and rectifying nodes in realsense launch pipeline which are not necessary as the image outputs are already rectified by default when specifying color frame format via config (IntelRealSense/librealsense#91, IntelRealSense/realsense-ros#1670, IntelRealSense/librealsense#11514)

• What is the new behavior (if this is a feature change)?

Color image outputs from the camera are directly used for creating color pointclouds and for object detection with yolov8.

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)

No

• Other information:

[marvind]

Looks good to me! 👍