add extra timeout value as well as some extra time.sleep() calls in an attempt to fix the test (seems race condition related)

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

AutomatedTesting/Gem/PythonTests/atom_renderer/atom_hydra_scripts/hydra_AtomMaterialEditor_BasicTests.py

@@ -67,6 +67,7 @@ def run():
     material_editor.save_document_as_child(document_id, target_path)
     material_editor.wait_for_condition(lambda: os.path.exists(target_path), 2.0)
     print(f"New asset created: {os.path.exists(target_path)}")
+    time.sleep(2.0)
 
     # Verify if the newly created document is open
     new_document_id = material_editor.open_material(target_path)
@@ -101,6 +102,7 @@ def run():
     expected_color = math.Color(0.25, 0.25, 0.25, 1.0)
     material_editor.set_property(document_id, property_name, expected_color)
     material_editor.save_document(document_id)
+    time.sleep(2.0)
 
     # 7) Test Case: Saving as a New Material
     # Assign new color to the material file and save the document as copy

AutomatedTesting/Gem/PythonTests/atom_renderer/test_Atom_MainSuite.py

@@ -299,7 +299,7 @@ class TestMaterialEditorBasicTests(object):
             generic_launcher,
             "hydra_AtomMaterialEditor_BasicTests.py",
             run_python="--runpython",
-            timeout=80,
+            timeout=EDITOR_TIMEOUT,
             expected_lines=expected_lines,
             unexpected_lines=unexpected_lines,
             halt_on_unexpected=True,