Rename test file for OTIO export plugin

- Renamed test_transcoding.py to test_export_otio.py
- Updated import path for get_image_info_metadata function.

client/ayon_core/tests/plugins/load/test_export_otio.py

@@ -1,7 +1,7 @@
 import pytest
 import logging
 from pathlib import Path
-from ayon_core.lib.transcoding import get_image_info_metadata
+from ayon_core.plugins.load.export_otio import get_image_info_metadata
 
 logger = logging.getLogger('test_transcoding')