Add goroutine stack dump in support bundle

[aniketraj1947]

Fixes #5243

This PR adds goroutine stack dump in support bundle for both agent and controller. Sample shown below for controller.

antrea % kubectl get pods -l app=antrea -n kube-system
NAME                                 READY   STATUS    RESTARTS   AGE
antrea-agent-lvnl6                   2/2     Running   0          57m
antrea-controller-668f6cc866-b4gxt   1/1     Running   0          57m

antrea % kubectl exec -it antrea-controller-668f6cc866-b4gxt -n kube-system -c antrea-controller bash
kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl exec [POD] -- [COMMAND] instead.
root@minikube:/# antctl supportbundle
Created bundle under /tmp
Expire time: 2023-10-01 17:07:18 +0000 UTC
root@minikube:/# tar -xzvf /tmp/bundle_269813909.tar.gz 
addressgroups
appliedtogroups
controllerinfo
goroutinestacks
logs/controller/antrea-controller.minikube.root.log.INFO.20231001-150949.1
memprofile
networkpolicies

root@minikube:/# head goroutinestacks 
goroutine 22252 [running]:
runtime/pprof.writeGoroutineStacks({0x2ab1a00, 0xc0003ac000})
        /usr/local/go/src/runtime/pprof/pprof.go:703 +0x6a
runtime/pprof.writeGoroutine({0x2ab1a00?, 0xc0003ac000?}, 0x4f3ff6?)
        /usr/local/go/src/runtime/pprof/pprof.go:692 +0x25
runtime/pprof.(*Profile).WriteTo(0x269762a?, {0x2ab1a00?, 0xc0003ac000?}, 0x4f2cbb?)
        /usr/local/go/src/runtime/pprof/pprof.go:329 +0x146
antrea.io/antrea/pkg/support.DumpGoroutinePprof({0x2af0860, 0x3f871a0}, {0xc000d211c0?, 0x19?})
        /antrea/pkg/support/dump.go:106 +0x1d5

The original issue also talks about addition of /metrics API response to support bundle but I hope it'd be fine if it's done in a follow-up PR.

[antoninbas]

This LGTM. I will wait for @tnqn to review since he opened the corresponding Github issue. In particular, Quan was originally asking for this to be optional (with an antctl command-line flag). But at the time, I don't think he was aware that we already collected the heap profile unconditionally. So let's see what he says.

[aniketraj1947]

@tnqn Did you get a chance to look at this? LMK if a CLI flag needs to be added.

[tnqn]

LGTM, the patch is really timely, even yesterday I was debugging a deadlock issue: #5565. With this enhancement, it could have been much easier to identify the root cause.

Now I don't think we need an extra flag since memprofile is already there, and even the other information included in the bundle could have something users don't want to be publicly visible, like address and log. We should perhaps always suggest users to share supportbundle in a private way.

[tnqn]

/test-e2e
/skip-networkpolicy
/skip-conformance