selftests/bpf: Add tracing multi intersect tests

Adding tracing multi tests for intersecting attached functions.

Using bits from (from 1 to 16 values) to specify (up to 4) attached
programs, and ra

selftests/bpf: Add tracing multi intersect tests

Adding tracing multi tests for intersecting attached functions.

Using bits from (from 1 to 16 values) to specify (up to 4) attached
programs, and randomly choosing bpf_fentry_test* functions they are
attached to.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20260606123955.345967-24-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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