fix: update codegen models to use v2 schema shapes (#316)

Author: alharris-at

packages/amplify-codegen-e2e-tests/schemas/modelgen/model_gen_schema_with_aws_scalars.graphql

@@ -31,24 +31,24 @@ type User @model {
 type Post @model {
   title: String!
   content: String
-  comments: [Comment] @connection(name: "PostComment")
+  comments: [Comment] @hasMany
 }
 
 type Comment @model {
   comment: String!
-  post: Post @connection(name: "PostComment")
+  post: Post @belongsTo
 }
 
 # 1:1 Connection
 
 type Person @model {
   id: ID!
   name: String!
-  license: License @connection
+  license: License @hasOne
 }
 
 type License @model {
   id: ID!
   number: String!
-  belongsTo: Person @connection
+  belongsTo: Person @belongsTo
 }