Refactor Wiki formats handling
What does this MR do and why?
With the removal of the Gollum lib in the wiki, the Wiki class is going to handle (and store) more responsibility regarding the formats it accepts.
In this MR we're adding some small logic to start handling that.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Francisco Javier López (ex-Gitlab)