enumValues don't work well with typesPrefix

**Describe the bug**

When specifying `typesPrefix` I cannot use `enumValues` to declare the values for my enum.

**To Reproduce**
Steps to reproduce the behavior: See sandbox https://codesandbox.io/s/musing-bouman-lsgqt?file=/codegen.yml

**Expected behavior**

When I use `enumValues` in conjunction with `typesPrefix` I can only define the `enumValue` for the enum before prefixing.

The prefixed enum value cannot be defined because I suppose the tool has no knowledge of it at the time of running the enumValues command.

If I try to define

```enumValues:
GraphqlFoobar: ./index#Foobar
```

instead it breaks because `GraphqlFoobar` is nowhere to be found in my schema (rightfully so, because it's prefixed after the generation).

`enumValues`'s result should use the prexixes/suffixes properly so those options combine well together.