Added Wiki Scenario Automation gitlab-qa#263

What does this MR do?

Adds feature automation for project wiki creation, edition and clone and modifying the wiki content. Fixes gitlab-qa#263 (closed)

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

gitlab-qa#263 (closed)

Edited by Rémy Coutable

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