insights: deprecate `insights` query

Created by: coury-clark

Code insights has a query in GraphQL - insights that was the first version of interacting with code insights over API. Since then we have added new queries that have new behaviors and assumptions, that align with the product after we migrated from insights defined insettings.

Known things to change:

1. Deprecate insights GraphQL query
2. Deprecate filter arguments on the InsightsSeries GraphQL type (replaced by arguments on the InsightViews query)