Deprecate GraphQL::Tracing::SkylightTracing
Deprecate GraphQL::Tracing::SkylightTracing

Warn when this class is initialized and suggest enabling Skylight's
GraphQL probe instead.

nevesenin/graphql-ruby,rmosolgo/graphql-ruby,rmosolgo/graphql-ruby,rmosolgo/graphql-ruby,nevesenin/graphql-ruby,nevesenin/graphql-ruby,nevesenin/graphql-ruby,rmosolgo/graphql-ruby