Decorator controller rewrite

[misohu]

#334

Changes:

• use Decorator controller instead of Composite controller.
• use metacontroller v3.0.0 (as it supports Decorator controller).

Tests:

• integration tests are checking also scenario where minio credentials are changed.

This PR resolves resource-dispatcher's issue as we can migrate to metacontroller v3

[DnPlas]

Thanks @misohu. I understand that this change has to be done in order to fix other (unrelated) issues, and that makes sense, but I wonder what does this change mean for the kfp-profile-controller. This is just for understanding how the operator may be affected.

[misohu]

Hi @DnPlas this should not affect the controller functionality vise. It just enables us to update the metacontroller to higher version. I dont think that the operator will be affected.

[DnPlas]

Closing as a duplicate of #344