Propagate cloud provider config

[anmazzotti]

kind/bug

What this PR does / why we need it:

This fixes the absence of the cloud-provider-name in the generated /etc/rancher/rke2/config.yaml

Consider this an hotfix. Due to the nature of the code, it seems to generate duplicate files. It's safe to ignore.
A proper fix would probably need refactoring of the entire bootstrap generation logic to make it more maintainable and understandable.

For example:

          {
              Path: "/etc/rancher/rke2/audit-policy.yaml",
              Owner: "root:root",
              Permissions: "0644",
              Encoding: "",
              Content: "test_audit",
              ContentFrom: nil,
          },
          {
              Path: "/etc/rancher/rke2/cloud-provider-config",
              Owner: "root:root",
              Permissions: "0644",
              Encoding: "",
              Content: "test_cloud_config",
              ContentFrom: nil,
          },
          {
              Path: "/etc/rancher/rke2/etcd-s3-ca.crt",
              Owner: "root:root",
              Permissions: "0640",
              Encoding: "",
              Content: "test_ca",
              ContentFrom: nil,
          },
          {
              Path: "/etc/rancher/rke2/cloud-provider-config",
              Owner: "root:root",
              Permissions: "0644",
              Encoding: "",
              Content: "test_cloud_config",
              ContentFrom: nil,
          },

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #567

Special notes for your reviewer:

Checklist:

• squashed commits into logical changes
• includes documentation
• adds unit tests
• adds or updates e2e tests