GET `/eth/v1/validator/{pubkey}/graffiti` clarification

**A couple of scenarios require clarification:**

1. The graffiti is described as `"Arbitrary data to set in the graffiti field of BeaconBlockBody"`. Should we be returning the exact graffiti that will be used when creating a block including the node info appended to the graffiti? Or should we just be returning the graffiti that was set / system wide default depending on the situation?

For context, Teku appends consensus layer (CL) and execution layer (EL) clients' information to the validator graffiti. More details are linked here: [validators-graffiti-client-append-format](https://docs.teku.consensys.io/development/reference/cli#validators-graffiti-client-append-format)

This clarification relates to whether the graffiti returned from the GET should include this appended format, or just the set graffiti, without the appended information.

2. In the response, the `pubkey` is described as an optional field. In what case would this be empty, as we will always have the value from the path parameter?