Add namelist switches and parameter file changes ahead of upcoming PR on Johnson & Berry electron transport model

[JessicaNeedham]

This PR sets groundwork for later changes that will implement the Johson & Berry electron transport model in FATES - see issue #1337 . This PR adds the fnps parameter to the parameter file - the later PR will remove it as a hard coded value. Based on comments in #1337 it remains a global parameter (not PFT dependent). This PR also adds in FATES side changes for a namelist switch that switches between FvCB 1980 and JB 2021 formulations for electron transport response to irradiance. To be synchronized with HLM side changes which are about to be merged.

Collaborators:

@glemieux @rgknox @alistairrogers

Expectation of Answer Changes:

Should be b4b

Checklist

No testing yet

All checklist items must be checked to enable merging this pull request:

Contributor

• The in-code documentation has been updated with descriptive comments
• The documentation has been assessed to determine if updates are necessary

Integrator

• FATES PASS/FAIL regression tests were run
• Evaluation of test results for answer changes was performed and results provided

Documentation

• Technical Note update:
• User's Guide update:

Test Results:

CTSM (or) E3SM (specify which) test hash-tag:

CTSM (or) E3SM (specify which) baseline hash-tag:

FATES baseline hash-tag:

Test Output:
No testing yet

[JessicaNeedham]

Updated to make the fnps parameter pft-dependent.

[glemieux]

Regression testing on derecho against fates-sci.1.81.1_api.38.0.0-ctsm5.3.027 is B4B as expected. This was tested with ESCOMP/CTSM#2904 which now includes an API update and default parameter file up associated with this PR.

Results: /glade/u/home/glemieux/ctsm/tests_pr1344-fates-026

[glemieux]

Regression testing on izumi against fates-sci.1.81.1_api.38.0.0-ctsm5.3.027 is B4B as expected as well.

Results: home/glemieux/ctsm/tests_0227-083900iz