selftests/bpf: validate struct_ops early failure detection logic

Add a simple test that validates that libbpf will reject isolated
struct_ops program early with helpful warning message.

Also validate that explicit use of such BPF program through BPF skeleton
after BPF object is open won't trigger any warnings.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20240507001335.1445325-7-andrii@kernel.org
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>

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