[ticket/11528] Revert Mink changes

PHPBB3-11528
Merge pull request #2691 from dhruvgoel92/ticket/11528

[ticket/11528] Revert all mink changes in functional tests

* dhruvgoel92/ticket/11528:
  [ticket/11528] Revert Mink changes
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/11528] Revert Mink changes