[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/email_batching_test.go

@@ -13,7 +13,7 @@ import (
 )
 
 func TestHandleNewNotifications(t *testing.T) {
-	th := Setup()
+	th := Setup(t)
 	defer th.TearDown()
 
 	id1 := model.NewId()
@@ -94,7 +94,7 @@ func TestHandleNewNotifications(t *testing.T) {
 }
 
 func TestCheckPendingNotifications(t *testing.T) {
-	th := Setup().InitBasic()
+	th := Setup(t).InitBasic()
 	defer th.TearDown()
 
 	job := NewEmailBatchingJob(th.Server, 128)
@@ -202,7 +202,7 @@ func TestCheckPendingNotifications(t *testing.T) {
  * Ensures that email batch interval defaults to 15 minutes for users that haven't explicitly set this preference
  */
 func TestCheckPendingNotificationsDefaultInterval(t *testing.T) {
-	th := Setup().InitBasic()
+	th := Setup(t).InitBasic()
 	defer th.TearDown()
 
 	job := NewEmailBatchingJob(th.Server, 128)
@@ -240,7 +240,7 @@ func TestCheckPendingNotificationsDefaultInterval(t *testing.T) {
  * Ensures that email batch interval defaults to 15 minutes if user preference is invalid
  */
 func TestCheckPendingNotificationsCantParseInterval(t *testing.T) {
-	th := Setup().InitBasic()
+	th := Setup(t).InitBasic()
 	defer th.TearDown()
 
 	job := NewEmailBatchingJob(th.Server, 128)
@@ -286,7 +286,7 @@ func TestCheckPendingNotificationsCantParseInterval(t *testing.T) {
  * Ensures that post contents are not included in notification email when email notification content type is set to generic
  */
 func TestRenderBatchedPostGeneric(t *testing.T) {
-	th := Setup()
+	th := Setup(t)
 	defer th.TearDown()
 
 	var post = &model.Post{}
@@ -313,7 +313,7 @@ func TestRenderBatchedPostGeneric(t *testing.T) {
  * Ensures that post contents included in notification email when email notification content type is set to full
  */
 func TestRenderBatchedPostFull(t *testing.T) {
-	th := Setup()
+	th := Setup(t)
 	defer th.TearDown()
 
 	var post = &model.Post{}