Better handling of some alerting errors (#13446)

* Better handling of some alerting errors

* Better error output

* Consolidate simple template parsing

* Fixes reported by phpstan (one was a bug, yay!)

* add back forgotten trim

* don't remove the template if there is no match

* Match previous behavior, which was inconsistent.

* use anonymous class for tests instead

* Oopsie, Stringable is PHP8+

* fix style

app/Http/Controllers/AlertTransportController.php

@@ -44,7 +44,8 @@ class AlertTransportController extends Controller
                 return response()->json(['status' => 'ok']);
             }
         } catch (\Exception $e) {
-            $result = $e->getMessage();
+            \Log::error($e);
+            $result = basename($e->getFile(), '.php') . ':' . $e->getLine() . ' ' . $e->getMessage();
         }
 
         return response()->json([