Global-Monitoring: Minor improvements

• Reload nftables only on changes
• Make naming consistent to the "k8s-apiserver-prep" role

Issue: #346 (closed)

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Merge Prerequisites

• Description and title are descriptive
• Code is readable and syntactically correct
• Code is understandable
• Tests added (if needed)
• Docs updated
• Commit messages look good

As a developer: please do not tick these boxes yourself. As a reviewer: please get yourself a hot beverage.