chore: ignore react-native-enriched-markdown in RNRepo

in case we will start supporting prebuilding this package,
it have to be denied from prebuilding so ci will test the local implementation

Author: radoslawrolka

apps/example/rnrepo.config.json

@@ -0,0 +1,6 @@
+{
+    "denyList": {
+        "android": ["react-native-enriched-markdown"],
+        "ios": ["react-native-enriched-markdown"]
+    }
+}