Jitter shadow map dithering pattern across frames when TAA is enabled

This improves shadow quality by reducing the visibility of the noisy
pattern caused by dithering.

This jittering also applies when FSR2 is enabled, as it provides its own
form of temporal antialiasing.

Co-authored-by: Clay John <claynjohn@gmail.com>

servers/rendering/renderer_rd/renderer_scene_render_rd.cpp

@@ -1131,6 +1131,7 @@ void RendererSceneRenderRD::render_scene(const Ref<RenderSceneBuffers> &p_render
 		scene_data.cam_orthogonal = p_camera_data->is_orthogonal;
 		scene_data.camera_visible_layers = p_camera_data->visible_layers;
 		scene_data.taa_jitter = p_camera_data->taa_jitter;
+		scene_data.taa_frame_count = p_camera_data->taa_frame_count;
 		scene_data.main_cam_transform = p_camera_data->main_transform;
 		scene_data.flip_y = !p_reflection_probe.is_valid();