Update to Ginkgo 2.0 when available

Summary

From https://gitlab.com/gitlab-org/cloud-native/gitlab-operator/-/jobs/1765374373#L49:

Ginkgo 2.0 is under active development and will introduce (a small number of) breaking changes.
To learn more, view the migration guide at https://github.com/onsi/ginkgo/blob/v2/docs/MIGRATING_TO_V2.md
To comment, chime in at https://github.com/onsi/ginkgo/issues/711
  You are passing a Done channel to a test node to test asynchronous behavior.  This is deprecated in Ginkgo V2.  Your test will run synchronously and the timeout will be ignored.
  Learn more at: https://github.com/onsi/ginkgo/blob/v2/docs/MIGRATING_TO_V2.md#removed-async-testing
    /builds/gitlab-org/cloud-native/gitlab-operator/controllers/suite_test.go:48
  You are using a custom reporter.  Support for custom reporters will likely be removed in V2.  Most users were using them to generate junit or teamcity reports and this functionality will be merged into the core reporter.  In addition, Ginkgo 2.0 will support emitting a JSON-formatted report that users can then manipulate to generate custom reports.
  If this change will be impactful to you please leave a comment on https://github.com/onsi/ginkgo/issues/711
  Learn more at: https://github.com/onsi/ginkgo/blob/v2/docs/MIGRATING_TO_V2.md#removed-custom-reporters
To silence deprecations that can be silenced set the following environment variable:
  ACK_GINKGO_DEPRECATIONS=1.16.4

Acceptance criteria

Edited by Clemens Beck