Allow MPAS driver to run without LBCs for global configurations

[elcarpenterNOAA]

Description

We would like to use the UW drivers to run a global configuration of MPAS, which is the default for MPAS, but as it currently stands, LBCs are required to run the driver, making it only applicable to regional runs.

If the LBCs tasks is removed, the MPAS driver won't run.

Additional Branch and Ticket Reference Numbers
Current MPAS App branch and the config that leads to the issue here.

Additional Context
In namelist.atmosphere, there is a field for

limited_area:
    config_apply_lbcs: false

but this does not fix the issue.