Refactor tctl InitFunc to return an authclient.ClientI #51093
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Returning the interface from the InitFunc allows tests to better mock the auth client, which permits tests to be run without an actual teleport process being launched.
The ClientI interface was also extended with additional methods that tctl was already relying on.
Motivation for this change is to permit writing tests for tctl commands that do not require a teleport process be running. For instance, tests that only exist to validate output of a tctl command given different configurations are now able to do so by mocking out response from auth instead of starting a process and updating the cluster auth preference for each test case.