[production/RRFS.v1] Umbrella for RRFS code speedups (in ccpp-physics and stochastic_physics) (#3061)

* Updates .gitmodules to point at proper ufsatm
* Updates FV3 component in this updated branch.
* Adds wcoss2 regression test: PASS
* Point at Jili fork for spp update
* Updates stochastic_physics
* Updates stochastic_physics to get bug fix.
* Updates .gitmodules to point at merged stochastic_physics
Updates stochastic_physics
* Updates bl_date to 20260227, and adds WCOSS2 log (passes with updated
answers to two tests)
* add hercules log: passed
* Points at merged ufsatm change
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Author: MatthewPyle-NOAA

FV3

@@ -1 +1 @@
-export BL_DATE=20251017
+export BL_DATE=20260227