Fixing up tests

Getting rid of assumptions in tests that rely on the file structure further up than the copy point. This
includes the relative location of the executable.

Also removing the empty executable option. While this isn't an unreasonable test, we don't have a good
capability today to run a test that relies on a relative path outside of the installed tree. We may re-add
this capability at a later date. By switching all the useability tests back to RunApp we can't control the
CLI arguments that are passed to the application, invalidating the need for that test.

refs idaholab#19022

test/tests/parser/multiple_inputs/tests

@@ -23,7 +23,7 @@
     [three_inputs_error]
       type = 'RunException'
       input = 'diffusion1a.i diffusion1c.i diffusion1d.i'
-      expect_err = 'test/tests/parser/multiple_inputs/diffusion1d.i:3: unused parameter '
+      expect_err = '/diffusion1d.i:3: unused parameter '
                    '\'BCs/right/invalid_param\''
       detail = 'while locating input errors in the correct file'
     []

test/tests/usability/tests

@@ -1,68 +1,62 @@
 [Tests]
-  # These tests intentionally use 'command' to demonstrate the command-line usability.
   issues = "#16410"
   design = "sqa/non_functional.md"
   collections = USABILITY
   [command-line]
     requirement = "The system will be operated using a command-line interface that"
     [empty]
-      type = RunCommand
-      method = opt
-      command = "../../moose_test-opt"
+      type = RunApp
+      no_additional_cli_args = True
+      expect_out = "Usage: \S+"
 
-      detail = "reports the available options in non are provided and"
+      detail = "reports the available options when none are provided and"
     []
     [flags]
-      type = RunCommand
-      method = opt
-      command = "../../moose_test-opt --help"
+      type = RunApp
+      cli_args = "--help"
+      no_additional_cli_args = True
+      expect_out = "Usage: \S+"
 
       detail = "accepts defined command-line flags."
     []
   []
   [input]
     requirement = "The system will be operated using"
     [input_file]
-      type = RunCommand
-      method = opt
-      command = "../../moose_test-opt -i input.i"
+      type = RunApp
+      input = 'input.i'
 
       detail = "an input file and"
     []
     [command_line]
-      type = RunCommand
-      method = opt
-      command = "../../moose_test-opt -i input.i Mesh/uniform_refine=1"
+      type = RunApp
+      input = 'input.i'
+      cli_args = "Mesh/uniform_refine=1"
 
       detail = "command-line options."
     []
   []
 
-  # The following tests do not use RunCommand, but use the 'command' parameter to demonstrate
-  # the actual command being run for usability. The application of mpiexec by RunApp/Exception
-  # is not designed to be used with 'command', so 'max_parallel' is set to one.
   [message]
-    type = RunApp
-    method = opt
-    command = "../../moose_test-opt -i input.i invalid_command=1"
-    expect_out = "unused parameter 'invalid_command'"
+    type = RunException
+    input = 'input.i'
+    cli_args = "invalid_command=1"
+    expect_err = "unused parameter 'invalid_command'"
     max_parallel = 1
 
     requirement = "The system shall return usage messages when unidentified arguments or incorrectly used arguments are passed."
   []
   [diagnostic]
     type = RunException
-    method = opt
-    command = "../../moose_test-opt -i bad.i"
+    input = 'bad.i'
     expect_err = "bad.i:13: missing closing '\[\]' for section"
     max_parallel = 1
 
     requirement = "The system shall provide diagnostics when the input file fails to parse, or the format is incorrect."
   []
   [normal]
     type = RunApp
-    method = opt
-    command = "../../moose_test-opt -i input.i"
+    input = 'input.i'
     expect_out = "Framework Information"
     max_parallel = 1