Turn on explicit AC, Leung_2023, and excess ice by default

[slevis-lmwg]

Description of changes

Pull Request for Answer-changing tag described in this card:
https://github.com/orgs/ESCOMP/projects/46/views/1?pane=issue&itemId=75893526

Specific notes

Contributors other than yourself, if any:
@ekluzek @wwieder

CTSM Issues Fixed (include github issue #):
Fixes #2466
Fixes #2568

Are answers expected to change (and if so in what way)?
Yes.

Any User Interface Changes (namelist or namelist defaults changes)?
Changed namelist defaults to make these items ON by default.

Does this create a need to change or add documentation? Did you do so?
Not me :-)

Testing performed, if any:
Not started.

[ekluzek]

I might be asking too early, but we want both excess ice and dust only changed for clm6_0 physics.

[slevis-lmwg]

While we finalize the finidat question, I will start some tests:

./build-namelist_test.pl has this expected failure:
525/3339 < FAIL> <Test Id: 525> <Desc: LeungDust_WO_Prigent>

./run_sys_tests -s aux_clm -c ctsm5.2.024 --skip-generate
on izumi for now

[ekluzek]

@slevis-lmwg and I went over this. This has everything in place needed here.

The card mentions maybe adding explicit testing for A/C. It's true we don't have that, but it will be turned on for clm6_0 and off for clm5_0 and clm4_5, so on and off are exercised.

[slevis-lmwg]

@ekluzek thank you for your help with this

[slevis-lmwg]

./build-namelist_test.pl OK, expected failure: Test Id: 525> <Desc: LeungDust_WO_Prigent

./run_sys_tests -s aux_clm -c ctsm5.2.025 -g ctsm5.2.026
izumi OK
derecho OK
Added use_init_interp = .true. and ran SMS_Lm13_PS.f19_g17.I2000Clm60BgcCrop.derecho_intel.clm-cropMonthOutput manually OK (diff from baseline)