Remove GraphQL schema for v0.8

[brunomenezes]

📄 Context

We made some house cleaning for old versions of rollups (i.e., rollups v0.8.2), but some definitions are still lingering around and another round of cleaning is necessary.

✔️ Solution

Remove and delete the graphQL schema definition for v0.8.

📈 Subtasks

• [ ] Remove definitions and folder for the schema.graphql for v0.8. located on graphql/schema/v0.8.
• [ ] Check for any reference in the codegen.yml that must be removed.
• [ ] Check for any tests that may have reference to it.

🎯 Definition of Done

• [ ] CI checks, and tests are passing.
• [ ] Codegen is working as expected.
• [ ] Vercel deployment is going through without problems.

[nevendyulgerov]

It appears that this is already done. Closing.