Always build eBPF; remove xtask #501

Job	Run time
build (ubuntu-latest, 1.80.1, kprobe)	1m 57s
build (ubuntu-latest, 1.80.1, kretprobe)	1m 36s
build (ubuntu-latest, 1.80.1, fentry)	1m 56s
build (ubuntu-latest, 1.80.1, fexit)	1m 36s
build (ubuntu-latest, 1.80.1, uprobe)	1m 43s
build (ubuntu-latest, 1.80.1, uretprobe)	2m 13s
build (ubuntu-latest, 1.80.1, sock_ops)	2m 15s
build (ubuntu-latest, 1.80.1, socket_filter)	1m 47s
build (ubuntu-latest, 1.80.1, sk_msg)	1m 45s
build (ubuntu-latest, 1.80.1, xdp)	1m 44s
build (ubuntu-latest, 1.80.1, cgroup_skb)	1m 46s
build (ubuntu-latest, 1.80.1, cgroup_sockopt)	1m 53s
build (ubuntu-latest, 1.80.1, cgroup_sysctl)	1m 48s
build (ubuntu-latest, 1.80.1, classifier)	1m 48s
build (ubuntu-latest, 1.80.1, lsm)	1m 52s
build (ubuntu-latest, 1.80.1, perf_event)	1m 37s
build (ubuntu-latest, 1.80.1, raw_tracepoint)	1m 48s
build (ubuntu-latest, 1.80.1, tp_btf)	1m 43s
build (ubuntu-latest, 1.80.1, tracepoint)	1m 43s
build (macos-13, 1.80.1, kprobe)	2m 57s
build (macos-14, 1.80.1, kprobe)	3m 29s
	40m 56s

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