Revert non-zero exit for unauthenticated status

Per @vhvb1989 feedback: unauthenticated is a valid result, not a
command failure. Non-zero exit should only be for unexpected errors.
The expiresOn and LoginGuardMiddleware improvements remain.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: spboyer

cli/azd/cmd/auth_status.go

@@ -117,12 +117,6 @@ func (a *authStatusAction) Run(ctx context.Context) (*actions.ActionResult, erro
 
 	if a.formatter.Kind() != output.NoneFormat {
 		a.formatter.Format(res, a.writer, nil)
-		if res.Status == contracts.AuthStatusUnauthenticated {
-			// Return ErrNoCurrentUser so the process exits non-zero.
-			// The JSON output is already written above; the UX middleware
-			// skips formatting for JSON output, so this won't double-print.
-			return nil, auth.ErrNoCurrentUser
-		}
 		return nil, nil
 	}
 
@@ -157,10 +151,6 @@ func (a *authStatusAction) Run(ctx context.Context) (*actions.ActionResult, erro
 			"The authentication mode is controlled externally and cannot be changed from within azd.")
 	}
 
-	if res.Status == contracts.AuthStatusUnauthenticated {
-		return nil, auth.ErrNoCurrentUser
-	}
-
 	return nil, nil
 }