Enabling Disambiguator extension on all WMF wikis

Previously  enabled on test, test2, and en.wiki.

This will enable us to:
1. Remove the disambiguation code from core
2. Stop requiring wikis to maintain disambiguation template lists
3. Enable features like warning users when they are linking to
   disambiguation pages

Bug: 50174
Change-Id: Idf025fcf6756da9d610403f5817749c863557e25
Merge "Enabling Disambiguator extension on all WMF wikis"