selftests/bpf: Modernize resolve_btfids test scaffolding

Refactor resolve_btfids test in order to:
  * use newer ASSERT_* macros instead of CHECK
  * extend the lifetime of loaded BTF to enable additional checks
  * cleanup unused/unnecessary code

Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev>
Link: https://lore.kernel.org/r/20260624005546.1818483-3-ihor.solodrai@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

0 files changed, 0 insertions, 0 deletions