Add all horizontal advection orders with del4 to overflow

[sbrus89]

Currently, the omega_pr suite contains the smoke_test_horiz_adv_order_2_del4 test, but the only del4 variant added by the overflow tasks is smoke_test_horiz_adv_order_4_del4. This PR adds a del4 variant for all orders.

Fixes #668

Checklist

• User's Guide has been updated
• Developer's Guide has been updated
• API documentation in the Developer's Guide (api.md) has any new or modified class, method and/or functions listed
• Documentation has been built locally and changes look as expected
• Testing comment in the PR documents testing used to verify the changes
• New tests have been added to a test suite

[cbegeman]

This is perfect. Can you just confirm that all tests appear when you do polaris list -t ocean/planar/overflow? If that's the case, I'm fine merging this small fix without further testing.

[sbrus89]

Testing

I was able to setup and run omega_pr with mpas-ocean on perlmutter cpu.

[sbrus89]

@cbegeman, they are all showing up for me with polaris list:

 148: ocean/planar/overflow/smoke_test_horiz_adv_order_2
 149: ocean/planar/overflow/smoke_test_horiz_adv_order_2_del4
 150: ocean/planar/overflow/smoke_test_horiz_adv_order_3
 151: ocean/planar/overflow/smoke_test_horiz_adv_order_3_del4
 152: ocean/planar/overflow/smoke_test_horiz_adv_order_4
 153: ocean/planar/overflow/smoke_test_horiz_adv_order_4_del4
 154: ocean/planar/overflow/rpe

[cbegeman]

Thanks, @sbrus89 !