chore: Add extension-tile-playground package to release please config (#1429)

Missed one line change to properly release new package. For context read
previous commit:
fbec58f

Author: jeremytchang

release-please-config.json

@@ -26,6 +26,7 @@
     "packages/code-editor": {},
     "packages/extension-api-explorer": {},
     "packages/extension-playground": {},
+    "packages/extension-tile-playground": {},
     "packages/extension-sdk": {
       "component": "extension-sdk",
       "versioning": "always-bump-patch"