GraphQL query for listing all organizations in instance for admin area

We need a GraphQL query to list all the organizations in an instance for the admin area.

See #419540 (closed) for designs.

In GraphQL query for listing a user's organizations (#417892 - closed) we created a query to list a user's organizations so we may be able to use that as a starting point.

Requirements

• Only works for admins
• Returns all organizations in the instance
• Uses app/graphql/types/organizations/organization_type.rb
• Supports pagination

Implementation plan

Needs refinement