selftests/bpf: Bump path and command buffer sizes in bpftool_helpers.c

selftests/bpf: Bump path and command buffer sizes in bpftool_helpers.c

The path length of 64 is way too low in some envirnoments, which leads
to subtle failures due to truncation [1].

Replace BPFTOOL_PATH_MAX_LEN with PATH_MAX, and set
BPFTOOL_FULL_CMD_MAX_LEN to double of PATH_MAX.

[1] https://github.com/libbpf/libbpf/actions/runs/22980753016/job/66719800527

Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20260312234820.439720-1-ihor.solodrai@linux.dev