Temporarily remove 7.17.X from the upgrade version list until integration tests are stable again (#5450)

Author: pchila

.agent-versions.json

@@ -4,8 +4,6 @@
     "8.15.0",
     "8.14.4-SNAPSHOT",
     "8.14.3",
-    "8.13.4",
-    "7.17.24-SNAPSHOT",
-    "7.17.23"
+    "8.13.4"
   ]
 }