Rework EE volume mount setting so default value will populate

[alisonlhart]

This PR reworks the EE volume mount setting so a default value of [] for the volume mounts array is assigned correctly.

Reason for the change:

Our EE volume mount settings didn't set default values of "" to the src, dest, and options fields due to apparent lack of vscode detection for settings default values at that nested depth.

This means the src, dest, and options values were set to their dictionary object values, for example:

          src: {
            default: "",
            description:
              "The name of the local volume or path to be mounted within execution environment.",
          },

The type would be object, and podman would either throw an error or the error would be output into the log (even if the setting was not used at all).

This PR also removes custom error handling so that podman can throw errors more accurately and display them through toast notifications rather than the log. This allows local volume mounts to be used, since there is no longer path detection required.

There is also a change to update the ANSIBLE_ADJACENT_COLLECTIONS__PATH value in ALS tests, since this path was being skipped previously in tests because the path didn't exist.

This also updates the docs generation script for ALS so empty arrays as default settings values aren't skipped.

Fixes #1524.

[cidrblock]

nice digging