MM-15889 Add unit tests for CSRF checks (#11058)

* MM-15889 Add unit tests for CSRF checks

* Moved CSRF token test to login tests

* Remove empty test

* Remove debug messages

app/authentication.go

@@ -15,7 +15,7 @@ import (
 type TokenLocation int
 
 const (
-	TokenLocationNotFound = iota
+	TokenLocationNotFound TokenLocation = iota
 	TokenLocationHeader
 	TokenLocationCookie
 	TokenLocationQueryString