Disable all existing project wikis functionality at once

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Proposal

When one creates Project Wikis, currently the only way to disable them is to do so one by one using the steps in the documentation. If the organization had many projects with wikis, it would mean disabling one by one. This Issue it to propose a global way to disable all project wikis.

Currently:

Changing this setting in gitlab.rb file only disables newly created projects but does not disable the previously existing projects:

gitlab_rails['gitlab_default_projects_features_wiki'] = false

A similar format could be added to disable wikis for old projects.