bug #28731 [Form] invalidate forms on transformation failures (xabbuh)

This PR was merged into the 2.8 branch.

Discussion
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[Form] invalidate forms on transformation failures

| Q             | A
| ------------- | ---
| Branch?       | 2.8
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #20916, #21242, #28584
| License       | MIT
| Doc PR        |

Commits
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385d9df29c invalidate forms on transformation failures

Author: fabpot

Resources/config/form.xml

@@ -166,6 +166,11 @@
             <tag name="form.type" alias="currency" />
         </service>
 
+        <service id="form.type_extension.form.transformation_failure_handling" class="Symfony\Component\Form\Extension\Core\Type\TransformationFailureExtension">
+            <tag name="form.type_extension" extended-type="Symfony\Component\Form\Extension\Core\Type\FormType" />
+            <argument type="service" id="translator" on-invalid="ignore" />
+        </service>
+
         <!-- FormTypeHttpFoundationExtension -->
         <service id="form.type_extension.form.http_foundation" class="Symfony\Component\Form\Extension\HttpFoundation\Type\FormTypeHttpFoundationExtension">
             <argument type="service" id="form.type_extension.form.request_handler" />