[ottf] silence console prints for ATE

This fixes #29010.

Signed-off-by: Tim Trippel <ttrippel@google.com>

Author: timothytrippel

sw/device/lib/testing/test_framework/ottf_main.c

@@ -183,7 +183,9 @@ void _ottf_main(void) {
 
 #if !OT_IS_ENGLISH_BREAKFAST
   if (!kOttfTestConfig.ignore_alerts) {
-    LOG_INFO("Enabling OTTF alert catcher");
+    if (!kOttfTestConfig.silence_console_prints) {
+      LOG_INFO("Enabling OTTF alert catcher");
+    }
     CHECK_STATUS_OK(ottf_alerts_enable_all());
   }
 #endif  // !OT_IS_ENGLISH_BREAKFAST