[ROX-17493] Separate core_bpf probes from the binary

[erthalion]

Separate CORE_BPF probes from the Collector binary itself:

• Investigate how use a libbpf skeleton with a custom probe content
• Implement a fallback to still load the probe from the binary
• Modify the build process upstream/downstream to include the probe into the image
• Document new failure scenarios

See ROX-17493 for more high-level details.