[skmo] Follow-up refactoring: replace remaining shell tasks with k8s.core

[vakwetu]

Address non-blocking review suggestions from evallesp and fultonj on ci-framework PR #3766.

In hooks/playbooks/skmo/prepare-leaf.yaml:

• Replace the 'Ensure leaf osp-secret exists' and 'Read leaf admin password' shell tasks with a single set_fact that parses the osp-secrets.env file directly using regex_findall. Pre-creating the secret in the leaf namespace is unnecessary because kustomize already creates it there during stage 6; the hook only ever needed the password value itself.
• Replace the 'Create TransportURL CR' and 'Wait for TransportURL' shell tasks with kubernetes.core.k8s (idempotent apply) and kubernetes.core.k8s_info with retries/until (condition polling).

In roles/federation/tasks/hook_controlplane_config.yml:

• Remove the redundant trailing | default('custom-ca-certs', true) from the _federation_ca_bundle_secret_name fact. The preceding cifmw_custom_ca_certs_secret_name | default('custom-ca-certs', true) already guarantees a non-empty value, making the outer default a no-op.

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✔️ openstack-k8s-operators-content-provider SUCCESS in 2h 12m 53s
❌ podified-multinode-edpm-deployment-crc FAILURE in 35m 46s
✔️ cifmw-crc-podified-edpm-baremetal SUCCESS in 1h 36m 16s
✔️ cifmw-crc-podified-edpm-baremetal-minor-update SUCCESS in 1h 58m 07s
✔️ cifmw-pod-zuul-files SUCCESS in 5m 56s
✔️ noop SUCCESS in 0s
✔️ cifmw-pod-ansible-test SUCCESS in 11m 06s
✔️ cifmw-pod-pre-commit SUCCESS in 9m 50s
✔️ cifmw-molecule-federation SUCCESS in 2m 13s