Cache various Repository Git operations
This caches the output of the following methods: * Repository#empty? * Repository#has_visible_content? * Repository#root_ref The cache for Repository#has_visible_content? is flushed whenever a commit is pushed to a new branch or an existing branch is removed. The cache for Repository#root_ref is only flushed whenever a user changes the default branch of a project. The cache for Repository#empty? is never explicitly flushed as there's no need for it.
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