Convert buoyantFoam tests to Exodiff tests

Use different reference meshes for the serial and parallel tests, as OpenFOAM gives different answers. Relax the tolerance on the parallel test. This is OK for now, as we are planning to move away from setting values by node anyway.
aurora-multiphysics · hsaunders1904 · Feb 9, 2024 · Oct 10, 2023 · Oct 10, 2023 · Oct 10, 2023
commit 7d5a066a4e1d1d55d23ab73f1495002602a03cfb
diff --git a/test/tests/buoyantFoam/.gitignore b/test/tests/buoyantFoam/.gitignore
@@ -11,5 +11,3 @@
 
 # Files for displaying OpenFOAM meshes in paraview
 **/buoyantCavity/*.foam
-
-!reference_mesh.e
diff --git a/test/tests/buoyantFoam/buoyantFoam_par/gold/run_out.e b/test/tests/buoyantFoam/buoyantFoam_par/gold/run_out.e
diff --git a/test/tests/buoyantFoam/buoyantFoam_par/tests b/test/tests/buoyantFoam/buoyantFoam_par/tests
@@ -1,17 +1,12 @@
 [Tests]
   [test]
     [run]
-      type=RunCommand
+      type=Exodiff
+      exodiff = 'run_out.e'
       command = './run.sh ../../../../hippo-opt'
       group='buoyantFoam'
       tags='parallel'
-    []
-    [verify]
-      type=RunCommand
-      command = '../scripts/check.sh run_out.e ../reference_mesh.e'
-      prereq=test/run
-      group='buoyantFoam'
-      tags='parallel'
+      rel_err = 5e-3
     []
   []
 []
diff --git a/test/tests/buoyantFoam/reference_mesh.e → ...antFoam/buoyantFoam_serial/gold/run_out.e b/test/tests/buoyantFoam/reference_mesh.e → ...antFoam/buoyantFoam_serial/gold/run_out.e
diff --git a/test/tests/buoyantFoam/buoyantFoam_serial/tests b/test/tests/buoyantFoam/buoyantFoam_serial/tests
@@ -1,17 +1,11 @@
 [Tests]
   [test]
     [run]
-      type=RunCommand
+      type=Exodiff
+      exodiff = 'run_out.e'
       command = './run.sh ../../../../hippo-opt'
       group='buoyantFoam'
       tags='serial'
     []
-    [verify]
-      type=RunCommand
-      command = '../scripts/check.sh run_out.e ../reference_mesh.e'
-      prereq=test/run
-      group='buoyantFoam'
-      tags='serial'
-    []
   []
 []
diff --git a/test/tests/buoyantFoam/scripts/check.sh b/test/tests/buoyantFoam/scripts/check.sh