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Add "MassMessageWikiAliases" configuration setting

Authored by Legoktm.

Description

Add "MassMessageWikiAliases" configuration setting

Useful for when a wiki's domain name has changed, but existing input
lists are expected to continue working using the old name.

These domain names are only for backward-compatibility, and will not be
shown in the site autocomplete drop-down menu (ApiQueryMMSites).

Bug: T111895
Change-Id: Ifa95320675f53282ff306ad0b0d8b02de4095418