[FEATURE] Migrate to the official Upbound AWS provider (EKS cluster)

[iamahgoub]

This issue is for migrating from community AWS provider to the official Upbound AWS provider. The scope of this issue is the EKS cluster composition.

Changes:

1. Install the official Upbound AWS provider -- this requires changes at repos/gitops-system/tools/crossplane/ i.e. adding the providers installation manifests. Note that the Upbound provider is broken down into service-level providers, and given that EKS cluster creation involves creating several cloud resources, several providers will be required -- this include: provider-aws-eks, provider-aws-vpc, provider-aws-ec2, and provider-aws-iam. A Kustomization has to be added under flux folder of the management cluster repos/gitops-system/cluster/mgmt/ for reconciling the installation manifests.
2. Updating EKS composition to use the MRs of the new providers -- this requires changes at repos/gitops-system/tools-config/crossplane-eks-composition/; the interface (XRD) should be kept the same.