Add end to end tests for Parca with Agent

[kakkoyun]

• Spawn up a cluster on CI
• Deploy
• Make sure basic functionality actually works

[knrt10]

One way I think of it is

• Create a pipeline and steps to install minikube and then create a cluster
• Once the cluster is up, on a different step deploy parca on the k8s cluster
• Then to test the functionality I would say checking whether the pods are up and running or not. And whether the metrics endpoint has some data popullated.

If this makes sense, I can start working on it.

[kakkoyun]

@knrt10 Yes, this is exactly what we're working on, to be more specific, @Sylfrena is working on.

Feel free to contribute the improvements after she's done with the initial work.