Support --cel-expression filter in hubble observe

[chancez]

This also updates cilium since the CEL filter expression is only available in main currently.

[marseel]

lgtm, but I would strongly encourage to try to get rid of cilium/cilium dependency until it's not too late :)
Most of the imports seem to care only about github.com/cilium/cilium/api / github.com/cilium/cilium/pkg/monitor/api / github.com/cilium/cilium/pkg/hubble/api/v1 and few other "random" imports.

[glibsm]

lgtm, but I would strongly encourage to try to get rid of cilium/cilium dependency until it's not too late :) Most of the imports seem to care only about github.com/cilium/cilium/api / github.com/cilium/cilium/pkg/monitor/api / github.com/cilium/cilium/pkg/hubble/api/v1 and few other "random" imports.

We've been asking for a module in api/ for years. There is no way to import api without importing cilium if they share the same module.

Also, the hubble codebase is about to merge into cilium/cilium anyway, so it's somewhat of a moot point now.

[chancez]

Yeah, I'm going to create a PR to cilium/cilium now that cilium/cilium#31893 is merged