Use `kubebuilder` style `Makefile`

[afritzler]

Suggested changes

Can we revert the Makefile to a kubebuilder style version? (an example is the one we are using here https://github.com/ironcore-dev/metal-operator/blob/main/Makefile)

[github-actions]

This issue is stale because it has been open for 90 days with no activity.

[github-actions]

This issue was closed because it has been inactive for 14 days since being marked as stale.