Upjet resources do not set observedGeneration in the Synced condition

### What happened?
upjet resources are not setting the `observedGeneration` in the `Synced` condition which causes the `lastTransitionTime` to be updated on every reconciliation cycle.

See https://github.com/crossplane/crossplane-runtime/issues/902 for more details.

### How can we reproduce it?
Create an upjet-based resource and put a watch on it. Observe that the resource is updated on every pollInterval and the only change is the `lastTransitionTime` in the `Synced` condition.

`WithObservedGeneration()` needs to be added to the `ReconcileSuccess()` conditions (and possibly others?)