Draft: Routing is missing for group wiki search

What does this MR do and why?

It is adding the root_ancestor_ids for scope_options for wiki_blobs in the GroupSearchResults. This attribute will be used to add the routing param for the group wiki search.

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Before	After

How to set up and validate locally

1. Ensure elasticsearch is enabled
2. Perform a Group wiki search. Verify that in the es query in the performance bar you see the routing param

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #430812 (closed)