RRFS: Use the 10-m wind gust diagnostic from RAP/HRRR

[jaymes-kenyon]

There is evidence that RRFS 10-m wind gusts are high biased, particularly in stable conditions. At present, the RRFS 10-m gust calculation uses a "unified" diagnostic (for all UFS applications). In turn, this diagnostic uses an internal calculation of PBL height based on a Richardson-number (Ri) approach.

In the proposed update, RRFS would use the RAP / HRRR diagnostic for 10-m wind gusts. This diagnostic considers the vertical profile of virtual potential temperature (theta-v) to determine a PBL height, rather than Ri.

This issue can be assigned to @jaymes-kenyon

For reference, the previous update (in Feb 2023) to the 10-m gust calculation can be found at https://github.com/NOAA-EMC/UPP/pull/637/files