Add PHPStan ignore rule for undefined typed data properties.

Author: matthijs-va

configs/phpstan.neon

@@ -9,5 +9,6 @@ parameters:
     - '#Unsafe usage of new static\(\)#'
     - '#\\Drupal calls should be avoided in classes#'
     - '#Method Drupal\\Core\\Form\\FormBuilderInterface::getForm\(\) invoked with#'
+    - '#Access to an undefined property Drupal\\Core\\TypedData\\TypedDataInterface::\$#'
   excludes_analyse:
     - '*/node_modules/*'