Fix: Operator, app template and benchmarking script errors after media type

Always set the media type before the file format.

Ref #142955

Pull Request: https://projects.blender.org/blender/blender/pulls/143433

tests/performance/tests/cycles.py

@@ -24,6 +24,7 @@ def _run(args):
     scene = bpy.context.scene
     scene.render.engine = 'CYCLES'
     scene.render.filepath = args['render_filepath']
+    scene.render.image_settings.media_type = 'IMAGE'
     scene.render.image_settings.file_format = 'PNG'
     scene.cycles.device = 'CPU' if device_type == 'CPU' else 'GPU'