Add tear down to APIv4 tests (#5250)

* Add tear down to APIv4 tests

* Defer tear downs

api4/team_test.go

@@ -14,6 +14,7 @@ import (
 
 func TestCreateTeam(t *testing.T) {
 	th := Setup().InitBasic()
+	defer TearDown()
 	Client := th.Client
 
 	team := &model.Team{Name: GenerateTestUsername(), DisplayName: "Some Team", Type: model.TEAM_OPEN}