Add kubetest2 deployer for e2e testing

[breuerfelix]

How to categorize this PR?

/kind test

What this PR does / why we need it:

Use kubetest2 to deploy a STACKIT cluster and provision it with a modified cloud-provider-stackit Helm chart. Run the e2e Kubernetes CSI storage tests via kubetest2 against the cluster

Which issue(s) this PR fixes:
Fixes STACKITSKE-8351

Special notes for your reviewer:

Breaking changes:

/hold

[ske-prow]

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

[ske-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[breuerfelix]

/test post-pull-cloud-provider-stackit-e2e-verify-k8s-1.36

[ske-prow]

@breuerfelix: The specified target(s) for /test were not found.
The following commands are available to trigger required jobs:

/test pull-cloud-provider-stackit-validate-renovate

/test pull-cloud-provider-stackit-verify

Use /test all to run the following jobs that were automatically triggered:

pull-cloud-provider-stackit-verify

Details

In response to this:

/test post-pull-cloud-provider-stackit-e2e-verify-k8s-1.36

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[breuerfelix]

/test e2e-1.36

[ske-prow]

@breuerfelix: The specified target(s) for /test were not found.
The following commands are available to trigger required jobs:

/test pull-cloud-provider-stackit-validate-renovate

/test pull-cloud-provider-stackit-verify

Use /test all to run the following jobs that were automatically triggered:

pull-cloud-provider-stackit-verify

Details

In response to this:

/test e2e-1.36

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[breuerfelix]

/test

[ske-prow]

@breuerfelix: The /test command needs one or more targets.
The following commands are available to trigger required jobs:

/test pull-cloud-provider-stackit-validate-renovate

/test pull-cloud-provider-stackit-verify

Use /test all to run the following jobs that were automatically triggered:

pull-cloud-provider-stackit-verify

Details

In response to this:

/test

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[breuerfelix]

/test post-pull-cloud-provider-stackit-e2e-verify-k8s-1.36

[ske-prow]

@breuerfelix: The specified target(s) for /test were not found.
The following commands are available to trigger required jobs:

/test pull-cloud-provider-stackit-validate-renovate

/test pull-cloud-provider-stackit-verify

Use /test all to run the following jobs that were automatically triggered:

pull-cloud-provider-stackit-verify

Details

In response to this:

/test post-pull-cloud-provider-stackit-e2e-verify-k8s-1.36

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.