Fix headers: cv_bridge.hpp migration & gmock include cleanup

[maeri18]

Change Overview

• changed cv_bridge.h imports to cv_bridge.hpp imports in these files :

1. spot_driver/src/api/default_image_client.cpp
2. spot_driver/src/conversions/decompress_images.cpp
3. spot_driver/src/image_stitcher/image_stitcher.cpp

• Commented gmock-generated-matchers.h import in spot_driver/test/include/spot_driver/matchers.hpp, as gmock-generated-matchers is not part of new versions of gmock.

[khughes-bdai]

Hi @maeri18, sorry for the delayed response! These changes don't build locally on Humble, so we should not merge this into main --

Starting >>> spot_driver
--- stderr: spot_driver                                      
/.../spot_ros2/spot_driver/src/api/default_image_client.cpp:9:10: fatal error: cv_bridge/cv_bridge.hpp: No such file or directory
    9 | #include <cv_bridge/cv_bridge.hpp>
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.

Is this intended for a newer distro of ROS?

[maeri18]

Hi @maeri18, sorry for the delayed response! These changes don't build locally on Humble, so we should not merge this into main --

Starting >>> spot_driver
--- stderr: spot_driver                                      
/.../spot_ros2/spot_driver/src/api/default_image_client.cpp:9:10: fatal error: cv_bridge/cv_bridge.hpp: No such file or directory
    9 | #include <cv_bridge/cv_bridge.hpp>
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.

Is this intended for a newer distro of ROS?

Hello, @khughes-bdai
Thank you for reviewing the pull request. Yes, this is intended for ros2 Jazzy.
I made these changes because I ran into errors around the mentioned file imports while trying to use the spot ros2 driver in a docker (Ubuntu 24.04 + ros2 jazzy) environment.