✨ Move `spec.allowAllInClusterTraffic` to `spec.ManagedSecurityGroups`

[EmilienM]

What this PR does / why we need it:

Move OpenStackCluster.Spec.AllowAllInClusterTraffic under OpenStackCluster.Spec.ManagedSecurityGroups.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes #1878

TODOs:

• [X] squashed commits
• if necessary:
  • [X] includes documentation
  • [X] adds unit tests

[netlify[bot]]

✅ Deploy Preview for kubernetes-sigs-cluster-api-openstack ready!

Name	Link
🔨 Latest commit	350b7e60ca116e8349035a65a263d4cddab651eb
🔍 Latest deploy log	https://app.netlify.com/sites/kubernetes-sigs-cluster-api-openstack/deploys/65d620b09687bc00083160ff
😎 Deploy Preview	https://deploy-preview-1892--kubernetes-sigs-cluster-api-openstack.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[EmilienM]

We need https://github.com/kubernetes-sigs/cluster-api-provider-openstack/pull/1826 to merge first.

[huxcrux]

/lgtm

[huxcrux]

/lgtm

[EmilienM]

/hold cancel

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: EmilienM, mdbooth

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubernetes-sigs/cluster-api-provider-openstack/blob/main/OWNERS)~~ [mdbooth] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[huxcrux]

/lgtm