[ticket/13064] Revert "[ticket/13064] Validate the migrations provided to ..."

This reverts commit 46a9fe93d797bf7d56fd9b1e204f3c0459270122.

PHPBB3-13064
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/13064] Revert "[ticket/13064] Validate the migrations provided to ..."