Moving physics test from sandbox to main (#3858)

Signed-off-by: evanchia <evanchia@amazon.com>

AutomatedTesting/Gem/PythonTests/physics/TestSuite_Main.py

@@ -84,3 +84,8 @@ class TestAutomation(TestAutomationBase):
     def test_C24308873_CylinderShapeCollider_CollidesWithPhysXTerrain(self, request, workspace, editor, launcher_platform):
         from .collider import C24308873_CylinderShapeCollider_CollidesWithPhysXTerrain as test_module
         self._run_test(request, workspace, editor, test_module)
+
+    @revert_physics_config
+    def test_C15425929_Undo_Redo(self, request, workspace, editor, launcher_platform):
+        from .general import C15425929_Undo_Redo as test_module
+        self._run_test(request, workspace, editor, test_module)

AutomatedTesting/Gem/PythonTests/physics/TestSuite_Sandbox.py

@@ -43,11 +43,3 @@ class TestAutomation(TestAutomationBase):
         # Fixme:    unexpected_lines.append(f"GroupName: {group}")
         # Fixme: expected_lines=["GroupName: "]
         self._run_test(request, workspace, editor, test_module)
-
-    ## Seems to be flaky, need to investigate
-    @pytest.mark.xfail(
-        reason="Editor crashes and errors about files accessed by multiple processes appear in the log.")
-    @revert_physics_config
-    def test_C15425929_Undo_Redo(self, request, workspace, editor, launcher_platform):
-        from .general import C15425929_Undo_Redo as test_module
-        self._run_test(request, workspace, editor, test_module)