signup: fix email sent logic for tempuser

Fixes #8656 and properly sets the email_sent and email_sent_on fields
for a tempuser (signup user).

pkg/models/temp_user.go

@@ -60,6 +60,10 @@ type UpdateTempUserStatusCommand struct {
 	Status TempUserStatus
 }
 
+type UpdateTempUserWithEmailSentCommand struct {
+	Code string
+}
+
 type GetTempUsersQuery struct {
 	OrgId  int64
 	Email  string