Rename StitchedSubgenerators -> TestSubgenerators

Logan is insistant that test objects should be clearly labeled as such.

Which makes sense, so I nominate him to fix the *other* 291 classes in
test/src/*/ that don't have "Test" in the name.

test/include/meshgenerators/StitchedSubgenerators.h → test/include/meshgenerators/TestSubgenerators.h

@@ -14,12 +14,12 @@
 /**
  * Allows multiple mesh files to be "stitched" together to form a single mesh.
  */
-class StitchedSubgenerators : public StitchedMeshGenerator
+class TestSubgenerators : public StitchedMeshGenerator
 {
 public:
   static InputParameters validParams();
 
-  StitchedSubgenerators(const InputParameters & parameters);
+  TestSubgenerators(const InputParameters & parameters);
 
 protected:
   /// The mesh generator input filenames to read

test/src/meshgenerators/StitchedSubgenerators.C → test/src/meshgenerators/TestSubgenerators.C

@@ -7,18 +7,18 @@
 //* Licensed under LGPL 2.1, please see LICENSE for details
 //* https://www.gnu.org/licenses/lgpl-2.1.html
 
-#include "StitchedSubgenerators.h"
+#include "TestSubgenerators.h"
 
 #include "CastUniquePointer.h"
 #include "MooseUtils.h"
 #include "FileMeshGenerator.h"
 
 #include "libmesh/replicated_mesh.h"
 
-registerMooseObject("MooseTestApp", StitchedSubgenerators);
+registerMooseObject("MooseTestApp", TestSubgenerators);
 
 InputParameters
-StitchedSubgenerators::validParams()
+TestSubgenerators::validParams()
 {
   InputParameters params = StitchedMeshGenerator::validParams();
 
@@ -28,7 +28,7 @@ StitchedSubgenerators::validParams()
   return params;
 }
 
-StitchedSubgenerators::StitchedSubgenerators(const InputParameters & parameters)
+TestSubgenerators::TestSubgenerators(const InputParameters & parameters)
   : StitchedMeshGenerator(parameters),
     _input_filenames(getParam<std::vector<std::string>>("input_files"))
 {

test/tests/meshgenerators/subgenerators/stitched_subgenerators.i

@@ -1,6 +1,6 @@
 [Mesh]
   [./smg]
-    type = StitchedSubgenerators
+    type = TestSubgenerators
     input_files = 'left.e center.e right.e'
     clear_stitched_boundary_ids = true
     stitch_boundaries_pairs = 'right left;