Adds a job to run cpm tests for ha shoots

[plkokanov]

/kind enhancement

What this PR does / why we need it:
This PR adds a test job for control plane migration of single zone HA shoots between single zone HA seeds.

Which issue(s) this PR fixes:
Part of gardener/gardener#6529

Special notes for your reviewer:

[oliver-goetz]

thanks 🚀

/lgtm
/approve

[gardener-prow]

LGTM label has been added.

Git tree hash: 970df9ae409986402622033e38daa96a52af8389

[gardener-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: oliver-goetz

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[gardener-prow]

@plkokanov: Updated the job-config configmap in namespace prow at cluster gardener-prow-trusted using the following files:

• key gardener-e2e-kind-migration-ha-single-zone.yaml using file config/jobs/gardener/gardener-e2e-kind-migration-ha-single-zone.yaml

In response to this:

/kind enhancement

What this PR does / why we need it:
This PR adds a test job for control plane migration of single zone HA shoots between single zone HA seeds.

Which issue(s) this PR fixes:
Part of gardener/gardener#6529

Special notes for your reviewer:

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/test-infra repository.