Pick kube-vip interface automatically by default

[sleiner]

Proposed Changes

• Currently, it is not possible to use multiple control nodes where the network interfaces to use have different names. This is due to the fact that {{ flannel_iface }} of the first control node will be hardcoded into the kube-vip manifest as the interface that all kube-vip pods must use.
• kube-vip is able to pick a matching interface per pod automatically for a "long time".
• This patch enables the automatic choice of interface by default and offers users the ability to override the interface if they want to (independently of flannel_iface, as requested in More customisation / overrides for kube-vip #221.

Checklist

• Tested locally
• Ran site.yml playbook
• Ran reset.yml playbook
• Did not add any unnecessary changes
• Ran pre-commit install at least once before committing
• 🚀

[timothystewart6]

Thank you!