selftests/bpf: Add test for libbpf_bpf_prog_type_str

This change adds a test for libbpf_bpf_prog_type_str. The test retrieves
all variants of the bpf_prog_type enumeration using BTF and makes sure
that the function under test works as expected for them.

Signed-off-by: Daniel Müller <[email protected]>
Signed-off-by: Andrii Nakryiko <[email protected]>
Acked-by: Quentin Monnet <[email protected]>
Acked-by: Yonghong Song <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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