re-create k8s client in case of failure

[neoaggelos]

Summary

Ensure that any changes in the kubeconfig files are picked up between client failures

[github-actions]

Package	Line Rate
github.com/canonical/k8s/api/v1	37%
github.com/canonical/k8s/cmd/k8s	33%
github.com/canonical/k8s/cmd/util	15%
github.com/canonical/k8s/pkg/client/dqlite	46%
github.com/canonical/k8s/pkg/component	10%
github.com/canonical/k8s/pkg/k8sd/controllers	67%
github.com/canonical/k8s/pkg/k8sd/database	48%
github.com/canonical/k8s/pkg/k8sd/pki	53%
github.com/canonical/k8s/pkg/k8sd/setup	75%
github.com/canonical/k8s/pkg/k8sd/types	81%
github.com/canonical/k8s/pkg/proxy	6%
github.com/canonical/k8s/pkg/snap	15%
github.com/canonical/k8s/pkg/snap/util	90%
github.com/canonical/k8s/pkg/utils	48%
github.com/canonical/k8s/pkg/utils/control	100%
github.com/canonical/k8s/pkg/utils/errors	100%
github.com/canonical/k8s/pkg/utils/k8s	69%
Summary	43% (2183 / 5057)

[bschimke95]

LGTM, will also update this in my PR for the node update controller.

[addyess]

I'm good on this too