libbpf: Deprecate bpf_prog_test_run_xattr and bpf_prog_test_run

Deprecate non-extendable bpf_prog_test_run{,_xattr} in favor of
OPTS-based bpf_prog_test_run_opts ([0]).

  [0] Closes: https://github.com/libbpf/libbpf/issues/286



Signed-off-by: Delyan Kratunov <delyank@fb.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220202235423.1097270-5-delyank@fb.com