cli: migrate the CLI and integration tests to the v1 HTTP API

Replace the gRPC client with the generated HTTP client across every
command: locally over the unix socket without auth (matching the previous
local gRPC socket), remotely over TLS with a Bearer API key. Output
rendering and integration tests move to the HTTP client types; the
transport changes, the assertions do not.

.github/workflows/test-integration.yaml

@@ -244,7 +244,7 @@ jobs:
           - TestACLDynamicUnknownUserRemoval
           - TestAPIAuthenticationBypass
           - TestAPIAuthenticationBypassCurl
-          - TestGRPCAuthenticationBypass
+          - TestRemoteCLIAuthenticationBypass
           - TestCLIWithConfigAuthenticationBypass
           - TestAuthKeyLogoutAndReloginSameUser
           - TestAuthKeyLogoutAndReloginNewUser