selftests/bpf: Augment send_signal test with remote signaling

Add testcases to test bpf_send_signal_task(). In these new test cases,
the main process triggers the BPF program and the forked process
receives the signals. The target process's signal handler receives a
cookie from the bpf program.

Signed-off-by: Puranjay Mohan <[email protected]>
Signed-off-by: Andrii Nakryiko <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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