Changes to List compact token and estimated cost usage for session cards

removed the agent_switch_saga enum value from the reporting_owner response property for the response status 500

removed the agent_switch_saga enum value from the reporting_owner response property for the response status 501

added the optional property reporting_owner to the response with the 500 status

added the optional property reporting_owner to the response with the 501 status

added the required property sessions/items/estimatedCost to the response with the 200 status

added the required property sessions/items/processedTokens to the response with the 200 status

endpoint added