selftests/bpf: Merge test_stub.c into testing_helpers.c

Move testing prog and object load wrappers (bpf_prog_test_load and
bpf_test_load_program) into testing_helpers.{c,h} and get rid of
otherwise useless test_stub.c. Make testing_helpers.c available to
non-test_progs binaries as well.

Signed-off-by: Andrii Nakryiko <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>
Acked-by: Dave Marchevsky <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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