feat(openthread): add extended example ci.json file

Added CI file to the example.

Author: SuGlider

libraries/OpenThread/examples/SimpleThreadNetwork/ExtendedRouterNode/ci.json

@@ -0,0 +1,9 @@
+{
+    "targets": {
+      "esp32": false,
+      "esp32c2": false,
+      "esp32c3": false,
+      "esp32s2": false,
+      "esp32s3": false
+    }
+  }