Remove heavy test as unnecessary

Author: mattfalcone1997

test/tests/multiapps/shell_tube_heat_exchanger/tests

@@ -16,17 +16,4 @@
     command = "bash -c './prep.sh -e 500 -w 50'"
     prereq = run_short
   []
-  [heavy_prep]
-    type = RunCommand
-    command = "bash -c './prep.sh -d -e 500 -w 50'"
-    heavy = true
-  []
-  [run_heavy]
-    type = RunApp
-    input = solid.i
-    min_parallel = 4
-    max_parallel = 4
-    prereq = heavy_prep
-    heavy = true
-  []
 []