Add GRPC experiments to Python dockerfile (#36525)

Author: jrmccluskey

sdks/python/container/Dockerfile

@@ -29,6 +29,11 @@ COPY target/launcher/${TARGETOS}_${TARGETARCH}/boot target/LICENSE target/NOTICE
 ENV CLOUDSDK_CORE_DISABLE_PROMPTS yes
 ENV PATH $PATH:/usr/local/gcloud/google-cloud-sdk/bin
 
+# Enable GRPC experiments to mitigate timeout issues in later versions
+# of the grpc package. 
+ENV GRPC_EXPERIMENTS="event_engine_fork,event_engine_poller_for_python"
+ENV GRPC_ENABLE_FORK_SUPPORT=1
+
 # Use one RUN command to reduce the number of layers.
 ARG py_version
 RUN  \