When a username option is not provided for the `gh codespace delete`
command, we will use the authenticated user's login as the default to
avoid deleting anyone else's codespace by mistake.
Prior to this change, running `gh codespace delete --org MYORG --all`
would fetch all of the codespacese associated with the org regardless of
user and then only delete the ones associated with the authenticated
user, which would lead to 404 errors when MYORG had codespaces owned by
members other than the authenticated member.
Co-authored-by: Victoria Dye <vdye@github.com>
Co-authored-by: Lessley Dennington <ldennington@github.com>
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