Added playbook for adding critical flag for interface

[Xartos]

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Platform Administrator notice

Added a new playbook for setting the critical dhcp flag for an interface

What does this PR do / why do we need this PR?

To be able to set the critical dhcp flag for existing clusters we needed to add a playbook for it

• Fixes elastisys/ck8s-ops#4756

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Checklist

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  • [ ] The metrics names did change (Grafana dashboards and Prometheus alerts were fixed)
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