selftests/bpf: Clean up user_ringbuf, cgrp_kfunc, kfunc_dynptr_param tests

Clean up user_ringbuf, cgrp_kfunc, and kfunc_dynptr_param tests to use
the generic verification tester for checking verifier rejections.
The generic verification tester uses btf_decl_tag-based annotations
for verifying that the tests fail with the expected log messages.

Signed-off-by: Joanne Koong <[email protected]>
Acked-by: David Vernet <[email protected]>
Reviewed-by: Roberto Sassu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexei Starovoitov <[email protected]>

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