interop: disable global-statement pylint warning in otel_interop_helper.py

Author: AgraVator

src/python/grpcio_tests/tests/interop/otel_interop_helper.py

@@ -120,6 +120,7 @@ def force_flush(self, timeout_millis: int = 30000) -> bool:
 
 
 def init_tracer_provider() -> Tuple[TracerProvider, trace.Tracer]:
+    # pylint: disable=global-statement
     global _GLOBAL_PROVIDER
     if _GLOBAL_PROVIDER is None:
         endpoint = os.environ.get(