Handle rov launch front camera regex return values

[OrionOth]

It seems that there has been a change in python? and now the re.search function can, instead of returning an empty list, return None. So, that has to be handled with a match statement. This also means now that if the front camera is not connected, it will fail gracefully. As I've implemented here, it will default to the top camera path. Hacks on top of hacks.

I'm sure you python programmers have a better way to do this, but as a rust programmer I would have added a single character:

front_camera_path = re.search(v4l2_regex, v4l2_devices)?.group(1)

[mike-matera]

Would you look at my branch called launch_microros_agent? I have made conflicting changes the Liam needs:

https://github.com/CabrilloRoboticsClub/cabrillo_rov_2023/tree/launch-micro-ros-agent

Also, the behavior hasn't changed. The search function either returns a Match object or None.