Advanced Search: Send project permissions and keep them in sync

What does this MR do and why?

This MR utilizes functionality introduced in gitlab-elasticsearch-indexer#86 (closed) to send visibility_level and repository_access_level when indexing commit documents. This MR also updates permission fields when the underlying project permissions changes.

#344460 (closed), part of &6974 (closed)

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Related to #344460 (closed)