Remove `.status.resolution` field

[everettraven]

The core maintainers chatted and determined that there does not exist a concrete use case for the .status.resolution field. As such, this field should be removed and the resolution information appropriately conveyed in any status condition messages representing an error after resolution has been successful but before installation has been successful.

Acceptance Criteria

• .status.resolution field is removed from the ClusterExtension API
• resolution information is included in status condition messages where necessary. Namely when an error occurs between successful resolution and successful installation
• Tests are updated as necessary to no longer use the .status.resolution field in assertions

[everettraven]

@LalatenduMohanty just a heads up that I just added a description to this issue