Re-Apply: Remove fork from mcm provider openstack and use newest release (#161)

[nschad]

/kind enhancement
/hold

What this PR does / why we need it:

Re-Apply PR #161

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Breaking changes:

[ske-prow]

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[nschad]

Wait for https://github.com/gardener/machine-controller-manager-provider-openstack release

[ske-prow]

@nschad: 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-gardener-extension-provider-stackit-integration-tests	08f38c4	link	true	/test pull-gardener-extension-provider-stackit-integration-tests

Full PR test history. Your PR dashboard. Command help for this repository.
Please help us cut down on flakes by linking this test failure to an open flake report or filing a new flake report if you can't find an existing one. Also see the gardener testing guideline for how to avoid and hunt flakes.

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