Docs: Document migration from GitLab-managed cluster to GitLab-managed Kubernetes resources

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Problem to solve

As a Platform Engineer, I want to migrate from the deprecated GitLab-managed cluster functionality to GitLab-managed Kubernetes resources.

Further details

Assume that the user already identified the cluster connection they want to migrate

Proposal

Add migration guides to https://docs.gitlab.com/ee/user/infrastructure/clusters/migrate_to_gitlab_agent.html based on https://gitlab.com/gitlab-org/cluster-integration/gitlab-agent/-/blob/master/doc/managed_resources.md?ref_type=heads

Who can address the issue

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