Fix EZP-22643 "Missing form token from Request " when creating an object after clearing cache

Depends on https://github.com/ezsystems/ezpublish-legacy/pull/963

Fixes 
* https://jira.ez.no/browse/EZP-22827 (this one is for sure)
* https://jira.ez.no/browse/EZP-22643
* Should also fix https://jira.ez.no/browse/EZP-22589

This is actually a regression from [EZP-22414](https://jira.ez.no/browse/EZP-22414) and [EZP-22531](https://jira.ez.no/browse/EZP-22531), combined with [EZP-22210](https://jira.ez.no/browse/EZP-22210) (CommentsBundle).
Rendering subrequests from a legacy template with the help of `ngsymfonytools` triggers a `kernel.response` Symfony event, which triggers the template collection from DebugBundle (only in dev). The problem here was that `ezxFormToken` was deactivated, and not reactivated after. So this ended up to a legitimate "missing form token" exception when submitting a form.

It was impossible to reproduce on master because `ngsymfonytools` extension failed to be installed due to a typo in `composer.json` of `ngsymfonytools-bundle`, while the extension was present in builds (and on @bdunogier's machine :-P)