apollo.router.graphql_error: Add subgraph name, operation name

[theJC]

Is your feature request related to a problem? Please describe.

We use apollo.router.graphql_error count for SLOs and monitors, but need to filter by subgraph name and operation name

Describe the solution you'd like

Add subgraph name and operation name tags to apollo.router.graphql_error

Describe alternatives you've considered

Building our own separate metric emanated from our coprocessor, but that would be inconsistent/emanated from a different service.