Always build eBPF; remove xtask #505

Job	Run time
build (ubuntu-latest, 1.80.1, kprobe)	1m 41s
build (ubuntu-latest, 1.80.1, kretprobe)	1m 41s
build (ubuntu-latest, 1.80.1, fentry)	1m 44s
build (ubuntu-latest, 1.80.1, fexit)	1m 39s
build (ubuntu-latest, 1.80.1, uprobe)	1m 46s
build (ubuntu-latest, 1.80.1, uretprobe)	1m 49s
build (ubuntu-latest, 1.80.1, sock_ops)	2m 1s
build (ubuntu-latest, 1.80.1, socket_filter)	1m 45s
build (ubuntu-latest, 1.80.1, sk_msg)	1m 42s
build (ubuntu-latest, 1.80.1, xdp)	1m 58s
build (ubuntu-latest, 1.80.1, cgroup_skb)	1m 49s
build (ubuntu-latest, 1.80.1, cgroup_sockopt)	1m 49s
build (ubuntu-latest, 1.80.1, cgroup_sysctl)	1m 47s
build (ubuntu-latest, 1.80.1, classifier)	1m 49s
build (ubuntu-latest, 1.80.1, lsm)	1m 41s
build (ubuntu-latest, 1.80.1, perf_event)	1m 38s
build (ubuntu-latest, 1.80.1, raw_tracepoint)	1m 39s
build (ubuntu-latest, 1.80.1, tp_btf)	1m 38s
build (ubuntu-latest, 1.80.1, tracepoint)	1m 45s
build (macos-13, 1.80.1, kprobe)	7m 14s
build (macos-14, 1.80.1, kprobe)	5m 5s
	45m 40s

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