Optimize Python Tests (#24823)

* Optimize tests

* Address comments

* Fix test

frigate/test/__init__.py

@@ -0,0 +1,11 @@
+from frigate.config.config import stream_info_retriever
+
+
+def _unreachable_stream_info(ffmpeg, path: str) -> dict:
+    return {"width": 0, "height": 0, "fourcc": None}
+
+
+# Validating a camera without detect dimensions probes its stream. Test streams
+# are unreachable, so return the failed probe result instead of waiting ~12s per
+# stream for ffprobe to time out
+stream_info_retriever.get_stream_info = _unreachable_stream_info