Currently, we're still shelling out to bpftool to obtain map and program usage metrics, despite starting to migrate to Go-based implementations years ago. We also use some bpftool feature probes.

Remaining items to port:

• pkg/metrics.getBPFUsage()
• pkg/datapath/linux/probes.(*ProbeManager).Probe()
• pkg/datapath/linux.CheckRequirements()

This issue is for converting the remaining users to Go-based probes.