Kitchensink chain: Add BEEFY support (#2856)

Related to https://github.com/paritytech/polkadot-sdk/issues/2787

Adding BEEFY support to the kitchensink chain in order to be able to
extend the current warp sync zombienet tests with BEEFY enabled

substrate/bin/node/cli/tests/res/default_genesis_config.json

@@ -45,6 +45,10 @@
   "grandpa": {
     "authorities": []
   },
+  "beefy": {
+    "authorities": [],
+    "genesisBlock": 1
+  },
   "treasury": {},
   "sudo": {
     "key": null