[TASK] Crossplane V2 Compatibility

[schlingemann]

Context

The CloudFoundry provider should support the following Crossplane V2 features:

• Namespace-scoped resources in addition to the current cluster-scoped resources (which should be kept as well, for backwards-compatibility) (see this guide)
• Safe-start capability (see this guide)

Prerequisites

• Single-image builds (done in chore: migrate from Upbound to Crossplane build infrastructure #101)

Acceptance Criteria

• Namespace-resources and cluster-scoped are both available for use and share as much code as possible
• E2E tests use namespace scoped resources
• Safe-start is implemented

Possible Follow-Up

• Use templating for the E2E test CRs to be able to easily switch between cluster-scoped and namespace-scoped resources