Bugfix and tuning for MYNN-SFC

[joeolson42]

This PR only updates the pointer to the MYNN-SFC, which includes:

1. fixes a bug for an uninitialized variable PSIQ10 (in land, ice, and water components)
2. tuning for config_mynn_sfcflux_land = 1, such that the reduction in Bowen ratio is at least halved over forests while a small reduction in the Bowen ratio is extended to grassland/cropland. Overall, this reduces the impact relative to the original code.
3. New code was added to the CI tests to check code coverage.
4. Some code cleanup was add, like removal of unused code.

Testing was done in single case study and CI tests in MYNN-SFC submodule.

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