⚠️ SubnetFilter to SubnetParam

[mdbooth]

See https://github.com/kubernetes-sigs/cluster-api-provider-openstack/issues/1975

TODO:

• [x] https://github.com/kubernetes-sigs/cluster-api-provider-openstack/pull/1972
• [x] Docs

/hold

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mdbooth

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[mdbooth]

/test pull-cluster-api-provider-openstack-e2e-full-test

[mdbooth]

/test pull-cluster-api-provider-openstack-e2e-full-test

[mdbooth]

Looks like a network-related flake

/test pull-cluster-api-provider-openstack-e2e-full-test

[mdbooth]

/test pull-cluster-api-provider-openstack-e2e-full-test

[mdbooth]

/hold cancel