one-deploy-validation semi airgap infrastructure validation

[rpetrescu-one]

Fix network validation reliability, storage benchmark fio install options and test_vm idempotency:

1. roles/test_vm/tasks/prepare.yml:

• check for existing VM template before attempting marketplace download
• skip download when template already exists
• fix set_fact for vm_template_id to correctly select between new and existing IDs

2. roles/storage_benchmark/tasks/storage_benchmark.yml:

• split fio installation into its own task and guard it with when: not (validation.storage_benchmark.skip_fio_install | d(false)) to allow skipping when the local built image already includes fio
• increase SSH readiness retries from 10 to 20 for slower VM boots

3. roles/network_validation/tasksmain.yml

• increase SSH readiness retries from 10×10s to 30×20s for slower VM boots
• fix shell quoting in GW ping command to prevent local $ variable expansion
• fix DNS check to use proper jq quoting
• increase ping count from 3 to 10 for GW and external host checks
• clean up result key names (remove leading \n, fix resolvation -> resolution)

4. playbooks/templates/appendix-cloud-report.j2:

• handle structured ping result objects in the report template: when a value is a mapping (ping result dict) render packets_received/packets_transmitted, packet loss %, and avg RTT instead of the raw dict
• fallback to plain string rendering for non-mapping values