Expose NFTables support in Flannel

[rifelpet]

Needed to fix jobs like this: https://testgrid.k8s.io/kops-distro-rocky10#kops-grid-flannel-rocky10arm64-k34

https://storage.googleapis.com/kubernetes-ci-logs/logs/e2e-kops-grid-flannel-rocky10arm64-k34/2043627932752023552/artifacts/cluster-info/kube-flannel/kube-flannel-ds-qtmlz/kube-flannel.log

E0413 10:18:28.718696 1 main.go:278] Failed to check br_netfilter: stat /proc/sys/net/bridge/bridge-nf-call-iptables: no such file or directory

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[k8s-ci-robot]

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[rifelpet]

/test pull-kops-e2e-cni-flannel

[rifelpet]

/test pull-kops-e2e-cni-flannel

[rifelpet]

/test pull-kops-e2e-cni-flannel

[rifelpet]

/test pull-kops-e2e-cni-flannel

[rifelpet]

/test pull-kops-e2e-cni-flannel

[rifelpet]

/test pull-kops-e2e-cni-flannel

[rifelpet]

/test pull-kops-e2e-cni-flannel

[rifelpet]

/test pull-kops-e2e-cni-flannel

[rifelpet]

/test pull-kops-e2e-cni-flannel

[rifelpet]

/test pull-kops-e2e-cni-flannel

[k8s-ci-robot]

@rifelpet: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kops-e2e-cni-flannel	301f96c	link	false	/test pull-kops-e2e-cni-flannel

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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