Add worker pool for managedk8s DISA STIG v2r4

[AleksandarSavchev]

How to categorize this PR?

/kind enhancement

What this PR does / why we need it:

Which issue(s) this PR fixes:
Pat of #696

Special notes for your reviewer:

Release note:

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/lifecycle stale

[gardener-ci-robot]

The Gardener project currently lacks enough active contributors to adequately respond to all PRs.
This bot triages PRs according to the following rules:

• After 30d of inactivity, lifecycle/stale is applied
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/lifecycle rotten

[dimityrmirchev]

/remove-lifecycle rotten