Failures in ebpf testing on multiple kernels

[lrishi]

Find all failures here: https://github.com/elastic/ebpf/actions/runs/2885114475
Keep the fix within scope.

[rhysre]

All failures have been fixed. The problems were as follows:

Ubuntu cloud kernels

Several 5.11-based Ubuntu cloud kernels (e.g. 5.11.0-1006-aws) did not enable BTF and thus we have no way of supporting them. These had to be weeded out kernel by kernel. There were offending kernels of the azure, aws, oracle and oem flavors. They were removed.

Kali3 kernels

Some 5.10.0 kali3 kernels were included by accident. We only support 5.10.10+. They were removed

All PREEMPT_RT kernels

Fixed by #129