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Remove Knative CRDs by group name instead of individually

João Alexandre Cunha requested to merge refactor/delete-kn-cr-by-api-group into master

What does this MR do?

Helm does not uninstall CustomResourceDefinitions (CRDs) from Kubernetes. So we had to track a list of existing CRDs to be deleted after Knative gets uninstalled.

This MR refactors the code to, instead of tracking a list of CRDs (big list), we track a list of these CRDs api-groups (much smaller list, less likely to change). With the list of api-groups, we can get the CRDs associated with them, then delete those CRDs.

Addresses follow-up ~backstage issue: #30562 (closed)

See the list of api-groups found for Knative current version (0.7.0)

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Does this MR meet the acceptance criteria?

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Security

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