CI/CD: Create Gardener test-clusters via Kyma CLI instead calling Gardner directly and passing Shoot-Spec

[tobiscr]

Description

Some pipelines are creating Gardener test clusters by sending a Shoot-Spec to the Gardener API. This has the drawback that the spec needs to be regularly updated when Gardener changes their API rules (e.g. removing support for particular VM images etc.). To avoid such efforts in the longterm, the Kyma CLI should be used to provision Gardener clusters instead calling the Gardener API directly.

AC:

• Instead calling the Gardner API and sending a Shoot-Spec, the Kyma CLI is used to provision a test cluster in Gardener
• Shoot-Spec is dropped from the test-infra repository

Reasons

Use Kyma CLI for Gardener interaction to avoid maintenance efforts for Gardener Shoot Spec.

Attachments

[tobiscr]

Only valid for old reconciler pipelines!

[kyma-bot]

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[janmedrek]

Since we are dropping the support for the old reconciler I am closing this issue. Cheers!