Add surface forcing and restoring to single_column test group

[cbegeman]

This PR fixes the port of the single_column planar cvmix test from legacy compass so that it includes surface forcing, surface restoring, and interior restoring. Since this forcing will be used for both the cvmix test case and the ideal age test (https://github.com/E3SM-Project/polaris/pull/60), the config section that controls these options is given the general heading single_column_forcing and these options are used in the test group's initial_state step. We assume that if any future single_column tests use different forcing, they will differentiate those options/methods at that time.

Checklist

• [X] User's Guide has been updated
• [X] Developer's Guide has been updated
• [X] Documentation has been built locally and changes look as expected
• [X] Testing comment in the PR documents testing used to verify the changes

[cbegeman]

Testing

The single_column cvmix test has been run with this forcing addition for 10 days on chrys with intel, open-mpi.

[cbegeman]

@xylar and @katsmith133 Thank you both for reviewing!