Passing t to all tests setup functions (#13841)

* Passing t to all tests setup functions

* Fixing build

cmd/mattermost/commands/cmdtestlib.go

@@ -36,13 +36,13 @@ type testHelper struct {
 }
 
 // Setup creates an instance of testHelper.
-func Setup() *testHelper {
+func Setup(t testing.TB) *testHelper {
 	dir, err := ioutil.TempDir("", "testHelper")
 	if err != nil {
 		panic("failed to create temporary directory: " + err.Error())
 	}
 
-	api4TestHelper := api4.Setup()
+	api4TestHelper := api4.Setup(t)
 
 	testHelper := &testHelper{
 		TestHelper:     api4TestHelper,