MM-9779: Incorporate a Token into the invitations system (#8604)

* Incorporate a Token into the invitations system

* Adding unit tests

* Fixing some api4 client tests

* Removing unnecesary hash validation

* Change the Hash concept on invitations with tokenId

* Not send invitation if it wasn't able to create the Token

* Fixing some naming problems

* Changing the hash query params received from the client side

* Removed unneded data param in the token usage

api/user.go

@@ -76,13 +76,13 @@ func createUser(c *Context, w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	hash := r.URL.Query().Get("h")
+	tokenId := r.URL.Query().Get("t")
 	inviteId := r.URL.Query().Get("iid")
 
 	var ruser *model.User
 	var err *model.AppError
-	if len(hash) > 0 {
-		ruser, err = c.App.CreateUserWithHash(user, hash, r.URL.Query().Get("d"))
+	if len(tokenId) > 0 {
+		ruser, err = c.App.CreateUserWithToken(user, tokenId)
 	} else if len(inviteId) > 0 {
 		ruser, err = c.App.CreateUserWithInviteId(user, inviteId)
 	} else {