selftests/bpf: Add uprobe sessions to consumer test

selftests/bpf: Add uprobe sessions to consumer test

Adding uprobe session consumers to the consumer test,
so we get the session into the test mix.

In addition scaling down the test to have just 1 uprobe
and 1 uretprobe, otherwise the test time grows and is
unsuitable for CI even with threads.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20241108134544.480660-13-jolsa@kernel.org