test(gcp consumer): attempt to stabilize flaky test
```
%%% emqx_bridge_kafka_impl_consumer_SUITE ==> ssl.t_start_and_consume_ok: FAILED
%%% emqx_bridge_kafka_impl_consumer_SUITE ==> {{panic,
#{msg => "Unexpected result",
result =>
{run_stage_failed,error,
{badmatch,{{1,0},timeout}},
[{emqx_bridge_kafka_impl_consumer_SUITE,
'-t_start_and_consume_ok/1-fun-12-',4,
[{file,
"/emqx/apps/emqx_bridge_kafka/test/emqx_bridge_kafka_impl_consumer_SUITE.erl"},
{line,1184}]},
{emqx_bridge_kafka_impl_consumer_SUITE,
t_start_and_consume_ok,1,
[{file,
"/emqx/apps/emqx_bridge_kafka/test/emqx_bridge_kafka_impl_consumer_SUITE.erl"},
{line,1171}]}]}}},
[{emqx_bridge_kafka_impl_consumer_SUITE,t_start_and_consume_ok,1,
[{file,
"/emqx/apps/emqx_bridge_kafka/test/emqx_bridge_kafka_impl_consumer_SUITE.erl"},
{line,1240}]},
```
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