Add skip patterns, tee to file, tensor load warning in dump comparator (#19600)

test/registered/debug_utils/comparator/conftest.py

@@ -0,0 +1,9 @@
+import pytest
+
+from sglang.srt.debug_utils.comparator.output_types import report_sink
+
+
+@pytest.fixture(autouse=True)
+def _reset_report_sink() -> None:
+    yield
+    report_sink._reset()