[MM-13833] Configured unit tests to log through t.Log (#10272)

* Rerouted the unit test logs through t.Log

* resolving merge confilvts

* Update testing.go

* Update helper_test.go

* Added godocs for NewTestingLogger

* Added go docs for NewTestingLogger

* Resolving conflicts

app/app_test.go

@@ -26,7 +26,7 @@ func TestAppRace(t *testing.T) {
 */
 
 func TestUpdateConfig(t *testing.T) {
-	th := Setup()
+	th := Setup(t)
 	defer th.TearDown()
 
 	prev := *th.App.Config().ServiceSettings.SiteURL
@@ -42,7 +42,7 @@ func TestUpdateConfig(t *testing.T) {
 }
 
 func TestDoAdvancedPermissionsMigration(t *testing.T) {
-	th := Setup()
+	th := Setup(t)
 	defer th.TearDown()
 
 	if mainHelper.SqlSupplier == nil {
@@ -421,7 +421,7 @@ func TestDoAdvancedPermissionsMigration(t *testing.T) {
 }
 
 func TestDoEmojisPermissionsMigration(t *testing.T) {
-	th := Setup()
+	th := Setup(t)
 	defer th.TearDown()
 
 	if mainHelper.SqlSupplier == nil {