gitignore the chain id in the subgraph package as its autogenerated and shouldnt cause the commit to change (#968)

Author: oveddan

packages/creator-subgraph/.gitignore

@@ -2,4 +2,5 @@ build/
 generated/
 .DS_Store
 subgraph.yaml
-graph-abis/**/*.json
+graph-abis/**/*.json
+src/constants/chainid.ts