fix(eks/cluster): outpost status fields optional

[wotolom]

Description of your changes

1.6686110160807893e+09 ERROR controller.managed/cluster.eks.aws.crossplane.io Reconciler error {"reconciler group": "eks.aws.crossplane.io", "reconciler kind": "Cluster", "name": "baum-dev-cluster-76fz7", "namespace": "", "error": "cannot update managed resource status: Cluster.eks.aws.crossplane.io "baum-dev-cluster-76fz7" is invalid: status.atProvider.outpostConfig.outpostArns: Required value"}

This change fixes the above error, which resulted in no status of the resource being delivered.

I have:

• Read and followed Crossplane's [contribution process].
• Run make reviewable test to ensure this PR is ready for review.

How has this code been tested

manually with the example

[wotolom]

@haarchri @MisterMX I think, it would be good, to get this fix into v0.34.0.

[haarchri]

Thanks