Merge branch 'mkstratos/tests/nbfb-grid-update' into master (PR #6289)

Use the new v3 ultra low-res test grids for e3sm_atm_nbfb test suite.
Depends on ESMCI/cime#4595 for TSC / PGN

[BFB]

* mks/mkstratos/tests/nbfb-grid-update:
  Use ne4pg2_oQU480 grid for EAM non-bit-for-bit tests

cime_config/tests.py

@@ -220,9 +220,9 @@
     #atmopheric nbfb tests
     "e3sm_atm_nbfb" : {
         "tests" : (
-            "PGN_P1x1.ne4_oQU240.F2010",
-            "TSC_PS.ne4_oQU240.F2010",
-            "MVK_PS.ne4_oQU240.F2010",
+            "PGN_P1x1.ne4pg2_oQU480.F2010",
+            "TSC_PS.ne4pg2_oQU480.F2010",
+            "MVK_PS.ne4pg2_oQU480.F2010",
             )
         },