Improve docker cache utiliaztion

[MikeWrock]

bind mounting this entire folder makes it way more likely to invalidate the docker cache (if any file is touched it will be invalidated, including changes to the install and log folder). All we really need is the package.xmls for this stage but I think we can watch the whole src folder for changes.

How to test:
First:

moveit_pro dev
🐙MoveIt Pro🐙:~/user_ws$ touch hello
Ctrl + D
moveit_pro dev

Notice the base image remains cached

Bonus test: Modify a package.xml and see how the rosdep install in the base layer reruns

Undo this fix, and:

moveit_pro dev
🐙MoveIt Pro🐙:~/user_ws$ touch world
Ctrl + D
moveit_pro dev

Notice how the base image has to apt-update even though the dependencies remain unchanged