fix: restore video directory doctests in CI coverage

Add getstream/video to the video test step so doctests inside that
directory are collected again.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Daksh

.github/workflows/run_tests.yml

@@ -114,5 +114,6 @@ jobs:
             tests/test_video_integration.py \
             tests/test_video_openai.py \
             tests/test_signaling.py \
-            tests/test_audio_stream_track.py
+            tests/test_audio_stream_track.py \
+            getstream/video