Add Light component GPU (screenshot) test to AutomatedTesting nightly o3de runs. (#2923)

* adds the Light component GPU screenshot test to AutomatedTesting

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

* add LIGHT_TYPE_PROPERTY constant to test script since it is re-used multiple times

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

* removes redundant f strings, adds LIGHT_COMPONENT and LIGHT_TYPE_PROPERTY constants for re-use, removed formattng errors, increase CMakeLists.txt timeout, add attach_component_to_entity() to hydra_editor_utils.py

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

* fix ImportError

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

* moves the LIGHT_TYPES constant to a new file since scripts rely on it that do not have the Editor launched (can't see hydra bindings so failes with ModuleNotFound error)

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

AutomatedTesting/Gem/PythonTests/atom_renderer/atom_utils/atom_constants.py

@@ -0,0 +1,19 @@
+"""
+Copyright (c) Contributors to the Open 3D Engine Project. For complete copyright and license terms please see the LICENSE at the root of this distribution.
+
+SPDX-License-Identifier: Apache-2.0 OR MIT
+
+Hold constants used across both hydra and non-hydra scripts.
+"""
+
+# Light type options for the Light component.
+LIGHT_TYPES = {
+    'unknown': 0,
+    'sphere': 1,
+    'spot_disk': 2,
+    'capsule': 3,
+    'quad': 4,
+    'polygon': 5,
+    'simple_point': 6,
+    'simple_spot': 7,
+}