selftests/bpf: Check faultable stack helper contexts

Add verifier coverage for the sleepable bpf_get_stack() and
bpf_get_task_stack() implementations. Call each helper while preemption is
disabled and require the verifier to reject it as sleepable.

Both programs load when the prototypes lack might_sleep, so the
expected-failure tests fail. Keep success controls outside the
non-preemptible region to ensure ordinary calls from sleepable uprobes
remain valid.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20260903214758.2727663-7-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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