tasks #7271: When docman wiki is deleted, reindex in wiki if not a cascade deletion

This task is part of story #7185 Search in existing wiki pages

Change-Id: Icb4557bbfff7cfc8482eeb24bac596ddcf952d2e
Merge commit 'refs/changes/13/2813/5' of ssh://gerrit.tuleap.net:29418/tuleap into tuleap-stable-master

* ssh://gerrit.tuleap.net:29418/tuleap:
  tasks #7271: When docman wiki is deleted, reindex in wiki if not a cascade deletion
Tuleap 7.3.99.12

Change-Id: I58f2ad576deb6cb0d1e4741f938dba7ad133ff94