[Interpreter]: Improve typings for the interpreter's "error" type

[lukeelmers]

In #37753 we introduced an interface for the shape of data that's returned by something in the interpreter that's type: 'error':

export interface InterpreterErrorType {
  type: 'error';
  error: unknown;
  info: unknown;
}

We should research the uses of the error type and add more detail around what types of values are passed to error and info so that we can have stronger typings for this interface. We should also consider whether InterpreterErrorType is the clearest name for this.

[elasticmachine]

Pinging @elastic/kibana-canvas

[elasticmachine]

Pinging @elastic/kibana-app-arch

[clintandrewhall]

I would expect:

export interface InterpreterError {
  type: 'error';
  error: Error;
  info: string;
}

[lukeelmers]

This was done in #54342