Remove allow_disk_access in rename namespaces/projects migration specs

James Fargherrequested to merge
allow_disk_rename_reserved_paths_migration into master

What does this MR do and why?

#375254 (closed)

These specs were relying on allow_disk_access to get the physical disk path of repositories in order to check that they exist. With gitaly cluster it will no be possible to determine where the repository is stored. So instead we refactor these tests to use the RepositoryExists RPC instead.

MR acceptance checklist

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

Edited by James Fargher

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