Remove unneed excludes from services autowiring (#1040)

As migrations went up to `migrations` folder and tests were never meant
to be in src folder, let's remove them from exclude clause as well

config/services.yaml

@@ -21,7 +21,7 @@ services:
     # this creates a service per class whose id is the fully-qualified class name
     App\:
         resource: '../src/*'
-        exclude: '../src/{Entity,Migrations,Tests,Kernel.php}'
+        exclude: '../src/{Entity,Kernel.php}'
 
     # Controllers are imported separately to make sure services can be injected
     # as action arguments even if you don't extend any base controller class