Update metal-stack support to latest changes

[robertvolkmann]

What this PR does / why we need it: Update metal-stack support to latest changes

Release note: Update metal-stack support to latest changes

[gardener-robot-ci-2]

Thank you @robertvolkmann for your contribution. Before I can start building your PR, a member of the organization must set the required label(s) {'reviewed/ok-to-test'}. Once started, you can check the build status in the PR checks section below.

[gardener-robot]

@robertvolkmann Thank you for your contribution.

[CLAassistant]

All committers have signed the CLA.

[holgerkoser]

Is this PR still draft or shouldn't it be ready for review?

[gardener-robot]

@robertvolkmann You need rebase this pull request with latest master branch. Please check.

[petersutter]

It seems that progress on this PR has paused for now. /close Please feel free to reopen it whenever you're ready to continue. Thank you for your contributions!