Remove unused --java_hard_deadline_ms flag, was removed in the previous PR and emits a useless warning.

PiperOrigin-RevId: 846489770
Change-Id: Id878b17571e851de6fb93cad05f71133d3c74798

Author: ludoch

runtime/main/src/main/java/com/google/apphosting/runtime/JavaRuntimeMainWithDefaults.java

@@ -111,7 +111,6 @@ private static List<String> getRuntimeFlags() {
         // "--fixed_application_path=" + ...,
         "--force_readahead_on_cloudsql_socket=true",
         "--interrupt_threads_first_on_soft_deadline=true",
-        "--java_hard_deadline_ms=10200",
         "--java_soft_deadline_ms=10600",
         "--jetty_http_port=" + jettyPort,
         "--jetty_request_header_size=262144",