Prevented entity "Not Found" events from being logged

- Added testing to cover, which was more hassle than thought
  since Laravel did not have built in log test helpers, so:
- Added Log testing helper.

Related to #2110

app/Config/logging.php

@@ -77,6 +77,13 @@ return [
             'driver' => 'monolog',
             'handler' => NullHandler::class,
         ],
+
+        // Testing channel
+        // Uses a shared testing instance during tests
+        // so that logs can be checked against.
+        'testing' => [
+            'driver' => 'testing',
+        ],
     ],
 
 ];

app/Exceptions/Handler.php

@@ -9,7 +9,6 @@ use Illuminate\Database\Eloquent\ModelNotFoundException;
 use Illuminate\Foundation\Exceptions\Handler as ExceptionHandler;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
-use Illuminate\Http\Response;
 use Illuminate\Validation\ValidationException;
 use Symfony\Component\HttpKernel\Exception\HttpException;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
@@ -26,6 +25,7 @@ class Handler extends ExceptionHandler
         HttpException::class,
         ModelNotFoundException::class,
         ValidationException::class,
+        NotFoundException::class,
     ];
 
     /**