Cleanup spec for ref_exists on GitalyClient
What does this MR do and why?
The specs in this file are only to check that the calls to the stubs are
hooked up correctly. The actual functionality that we depend on is
tested in Gitlab::Git::Repository
. So remove the duplicate tests.
Additionally soon we will begin to use the praefect database in tests and when this happens we can no longer rely on being able to directly access repositories without praefect knowing.
So a small cleanup.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.