Bump operator-rs to 0.27.1

[Maleware]

Update operator-rs to 0.27.1.

• operator-rs bumped
• operator has no dependecy on kube or serde_yaml (use [Merged by Bors] - Ensure that explicit YAML documents are generated for CRDs operator-rs#450 instead)
• Use Fragment wherever possible
• Orphaned resources mechanism is used
• Use parser for k9s Quantity instead of parsing memory values yourself

Product image selection will be tracked later on by stackabletech/issues#305 but should be pretty easy compared to the changes in this Issue