Mm 47648 check license expandable (#21770)

* [MM-47648] Handler for check if a subscription is expandable

* Mock cloud regenerate

* PR Webapp test purpose only

* [MM-47648] Refactor and tests for expand stats for a subscription

* Fix typos

* style fix

* has to be revert

* CWS URL to Spinwick

* new spinwick url

* target portal test

* Generate token instead of send licenseId

* Rename

* Rename methods

* Revert public key and cws url

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

model/cloud.go

@@ -124,6 +124,10 @@ type ValidateBusinessEmailResponse struct {
 	IsValid bool `json:"is_valid"`
 }
 
+type SubscriptionExpandStatus struct {
+	IsExpandable bool `json:"is_expandable"`
+}
+
 // CloudCustomerInfo represents editable info of a customer.
 type CloudCustomerInfo struct {
 	Name                  string `json:"name"`