Migrate saved queries from settings to dedicated Postgres table: GQL API, query-runner, webapp changes (!3867) · Merge requests · Warren Gifford / sourcegraph

Created by: attfarhan

Split out from #3512. Depends on #3866.

This PR updates the GraphQL API, webapp, and query-runner service to use the new saved_searches database table.

Migrate saved queries from settings to dedicated Postgres table: GQL API, query-runner, webapp changes