Always build eBPF; remove xtask #495

Job	Run time
build (ubuntu-latest, 1.80.1, kprobe)	2m 51s
build (ubuntu-latest, 1.80.1, kretprobe)	2m 51s
build (ubuntu-latest, 1.80.1, fentry)	2m 47s
build (ubuntu-latest, 1.80.1, fexit)	3m 0s
build (ubuntu-latest, 1.80.1, uprobe)	2m 56s
build (ubuntu-latest, 1.80.1, uretprobe)	2m 54s
build (ubuntu-latest, 1.80.1, sock_ops)	3m 3s
build (ubuntu-latest, 1.80.1, socket_filter)	2m 45s
build (ubuntu-latest, 1.80.1, sk_msg)	1m 35s
build (ubuntu-latest, 1.80.1, xdp)	2m 57s
build (ubuntu-latest, 1.80.1, cgroup_skb)	3m 6s
build (ubuntu-latest, 1.80.1, cgroup_sockopt)	2m 49s
build (ubuntu-latest, 1.80.1, cgroup_sysctl)	2m 52s
build (ubuntu-latest, 1.80.1, classifier)	2m 58s
build (ubuntu-latest, 1.80.1, lsm)	2m 59s
build (ubuntu-latest, 1.80.1, perf_event)	2m 56s
build (ubuntu-latest, 1.80.1, raw_tracepoint)	2m 46s
build (ubuntu-latest, 1.80.1, tp_btf)	2m 53s
build (ubuntu-latest, 1.80.1, tracepoint)	2m 48s
build (macos-13, 1.80.1, kprobe)	11m 59s
build (macos-14, 1.80.1, kprobe)	2m 12s
	1h 7m 57s

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