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fix(gql_websocket_link): Fix race condition causing exception and double complete #939

Job	Run time
publish_dry_run	15s
Check gql_example_cli	44s
Check end_to_end_test	56s
Check gql_example_cli_github	53s
Check gql	36s
Check end_to_end_test_tristate	56s
Check gql_example_build	47s
Check gql_exec	31s
Check gql_example_http_auth_link	24s
Check gql_code_builder_serializers	23s
Check gql_example_dio_link	25s
Check gql_build	29s
Check gql_code_builder	53s
Check gql_link	24s
Check gql_dedupe_link	30s
Check gql_dio_link	50s
Check gql_error_link	30s
Check gql_http_link	52s
Check gql_websocket_link	1m 12s
Check gql_transform_link	33s
Check gql_tristate_value	30s
	13m 33s

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