increase bench test timeouts to 15 min

Signed-off-by: Alexandra Iordache <[email protected]>

Author: Alexandra Iordache

.buildkite/custom-tests.json

@@ -30,7 +30,8 @@
             "platform": [
                 "x86_64",
                 "aarch64"
-            ]
+            ],
+            "timeout_in_minutes": 15
         }
     ]
 }