[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/file_test.go

@@ -41,7 +41,7 @@ func TestGeneratePublicLinkHash(t *testing.T) {
 }
 
 func TestDoUploadFile(t *testing.T) {
-	th := Setup()
+	th := Setup(t)
 	defer th.TearDown()
 
 	teamId := model.NewId()
@@ -108,7 +108,7 @@ func TestDoUploadFile(t *testing.T) {
 }
 
 func TestUploadFile(t *testing.T) {
-	th := Setup()
+	th := Setup(t)
 	defer th.TearDown()
 
 	channelId := model.NewId()
@@ -132,7 +132,7 @@ func TestUploadFile(t *testing.T) {
 }
 
 func TestGetInfoForFilename(t *testing.T) {
-	th := Setup().InitBasic()
+	th := Setup(t).InitBasic()
 	defer th.TearDown()
 
 	post := th.BasicPost
@@ -146,7 +146,7 @@ func TestGetInfoForFilename(t *testing.T) {
 }
 
 func TestFindTeamIdForFilename(t *testing.T) {
-	th := Setup().InitBasic()
+	th := Setup(t).InitBasic()
 	defer th.TearDown()
 
 	teamId := th.App.FindTeamIdForFilename(th.BasicPost, fmt.Sprintf("/%v/%v/%v/blargh.png", th.BasicChannel.Id, th.BasicUser.Id, "someid"))
@@ -160,7 +160,7 @@ func TestFindTeamIdForFilename(t *testing.T) {
 }
 
 func TestMigrateFilenamesToFileInfos(t *testing.T) {
-	th := Setup().InitBasic()
+	th := Setup(t).InitBasic()
 	defer th.TearDown()
 
 	post := th.BasicPost
@@ -187,7 +187,7 @@ func TestMigrateFilenamesToFileInfos(t *testing.T) {
 }
 
 func TestCopyFileInfos(t *testing.T) {
-	th := Setup().InitBasic()
+	th := Setup(t).InitBasic()
 	defer th.TearDown()
 
 	teamId := model.NewId()