[MM-49921] Cloud export compliance (#22189)

* Support for export compliance screening in cloud

* i18n

* Refactor error

* Fix

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

api4/cloud.go

@@ -131,7 +131,13 @@ func changeSubscription(c *Context, w http.ResponseWriter, r *http.Request) {
 
 	changedSub, err := c.App.Cloud().ChangeSubscription(userId, currentSubscription.ID, subscriptionChange)
 	if err != nil {
-		c.Err = model.NewAppError("Api4.changeSubscription", "api.cloud.app_error", nil, "", http.StatusInternalServerError).Wrap(err)
+		appErr := model.NewAppError("Api4.changeSubscription", "api.cloud.app_error", nil, "", http.StatusInternalServerError).Wrap(err)
+		if err.Error() == "compliance-failed" {
+			c.Logger.Error("Compliance check failed", mlog.Err(err))
+			appErr.StatusCode = http.StatusUnprocessableEntity
+		}
+
+		c.Err = appErr
 		return
 	}