Re-enable unix-socket-backlog checking in ci #888

Job	Run time
Build libbpf in Docker (aarch64, emulated)	3m 30s
Build ebpf_exporter in Docker (aarch64, emulated, built-in libbpf)	11m 57s
Build ebpf_exporter in Docker (x86_64, built-in libbpf)	1m 16s
Build ebpf_exporter (x86_64, dynamically linked, built-in libbpf)	26s
Build ebpf_exporter (x86_64, statically linked, built-in libbpf)	35s
Build libbpf in Docker (x86_64)	29s
Build examples (x86_64, built-in libbpf)	32s
Build tracing demos (x86_64)	30s
Run clang-format check	11s
Run jsonschema checks	8s
Lint ebpf_exporter (x86_64, built-in libbpf)	24s
Run markdown-links-check	16s
Test ebpf_exporter (x86_64, built-in libbpf)	1m 4s
Publish Docker images (x86_64, aarch64)	12m 48s
Build ebpf_exporter (x86_64, dynamically linked, system libbpf)	32s
Build ebpf_exporter (x86_64, statically linked, system libbpf)	26s
Build examples (x86_64, system libbpf)	27s
Test ebpf_exporter (x86_64, system libbpf)	55s
Check examples	9s
Release archive	12s
	36m 47s

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