The regression matrix runs the suite with --df enable_resp_io_loop_v2
set to both false and true. That flag overrides the @dfly_args default,
so the two V2-only CLIENT PAUSE tests ran under V1 and failed on their
assert is_resp_io_loop_v2 guard.

Replace the assert with a pytest.skip so the tests skip cleanly on the
V1 leg instead of failing, while still running under V2.