Always build eBPF; remove xtask #504

Job	Run time
build (ubuntu-latest, 1.80.1, kprobe)	39s
build (ubuntu-latest, 1.80.1, kretprobe)	40s
build (ubuntu-latest, 1.80.1, fentry)	36s
build (ubuntu-latest, 1.80.1, fexit)	37s
build (ubuntu-latest, 1.80.1, uprobe)	36s
build (ubuntu-latest, 1.80.1, uretprobe)	33s
build (ubuntu-latest, 1.80.1, sock_ops)	35s
build (ubuntu-latest, 1.80.1, socket_filter)	42s
build (ubuntu-latest, 1.80.1, sk_msg)	33s
build (ubuntu-latest, 1.80.1, xdp)	40s
build (ubuntu-latest, 1.80.1, cgroup_skb)	33s
build (ubuntu-latest, 1.80.1, cgroup_sockopt)	32s
build (ubuntu-latest, 1.80.1, cgroup_sysctl)	43s
build (ubuntu-latest, 1.80.1, classifier)	46s
build (ubuntu-latest, 1.80.1, lsm)	53s
build (ubuntu-latest, 1.80.1, perf_event)	31s
build (ubuntu-latest, 1.80.1, raw_tracepoint)	32s
build (ubuntu-latest, 1.80.1, tp_btf)	1m 41s
build (ubuntu-latest, 1.80.1, tracepoint)	32s
build (macos-13, 1.80.1, kprobe)	1m 42s
build (macos-14, 1.80.1, kprobe)	1m 43s
	16m 19s

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