add grid_container_dimensions test

e2etests/stable_test.go

@@ -2869,6 +2869,7 @@ y: profits {
 		loadFromFile(t, "grid_edge_across_cell"),
 		loadFromFile(t, "nesting_power"),
 		loadFromFile(t, "unfilled_triangle"),
+		loadFromFile(t, "grid_container_dimensions"),
 		loadFromFile(t, "grid_label_positions"),
 	}
 

e2etests/testdata/files/grid_container_dimensions.d2

@@ -0,0 +1,11 @@
+grid: {
+  width: 200
+  height: 200
+  grid-gap: 0
+  grid-rows: 2
+  grid-columns: 2
+  a
+  b
+  c
+  d
+}