Changes to POST /experimental/workspaces/:workspaceId/integrations/linear/callback

added the non-success response with the status 409

added the optional property data/attributes/returnTo to the response with the 201 status

removed the optional property data/attributes/connectionData/targetRepo from the response with the 201 status

added the optional property error/code to the response with the 403 status

added the optional property error/url to the response with the 403 status