Checks: Reconcile loop modifies resource without storing the changes in a single reconcile loop

[odubajDT]

During a reconcile loop which handles the pre- or post-deployment checks, there is a situation, where the logic modifies the workloadinstance object but does not store the changes via K8s API. In this case, the modified object stays in the memory until another reconcile loop handles it.

Steps to reproduce:

• create a deployment without post-deployment checks
• after the binding of the pods is finished, you will receive an error in the logs

Operation cannot be fulfilled on keptnworkloadinstances.lifecycle.keptn.sh \"podtato-head-podtato-head-left-arm-0.1.0\": the object has been modified; please apply your changes to the latest version and try again

The operator should not receive such an error at all, although the implementation works good

[bacherfl]

This will probably be solved by passing the builder.WithPredicates(predicate.GenerationChangedPredicate{}) option, which is added in #55

[odubajDT]

Agree, it will be solved by this PR