Issue #3507536: Switch to conditional usage of PHPStan for upstream incompatibilities

Closes #3507536

phpstan-baseline-getExtras.neon

@@ -2,6 +2,11 @@ parameters:
   ignoreErrors:
     -
        message: "#^Call to function method_exists\\(\\) with 'Drupal\\\\\\\\Core\\\\\\\\Recipe\\\\\\\\Recipe' and 'getExtra' will always evaluate to true\\.$#"
-       paths:
-         - src/Activator/RecipeActivator.php
-         - tests/src/Kernel/RecipeActivatorTest.php
+       identifier: function.alreadyNarrowedType
+       count: 1
+       path: src/Activator/RecipeActivator.php
+    -
+       message: "#^Call to function method_exists\\(\\) with 'Drupal\\\\\\\\Core\\\\\\\\Recipe\\\\\\\\Recipe' and 'getExtra' will always evaluate to true\\.$#"
+       identifier: function.alreadyNarrowedType
+       count: 1
+       path: tests/src/Kernel/RecipeActivatorTest.php