feat(ztp): add ZTP policy diagnosis prompt

[edcdavid]

Summary

• Adds a new ztp-policy-diagnose server prompt that automates diagnosis of NonCompliant ACM policies in ZTP GitOps environments
• The prompt handler pre-fetches live cluster data (policy status, per-cluster compliance history, PlacementBinding/PlacementDecision details, and ArgoCD Application state) and assembles a multi-level investigation workflow
• Includes pattern-matching heuristics for common ZTP failure modes: placement mismatches, oscillating compliance, immutable field rejections, hub template rendering failures, and deploy-wave ordering violations

Changes

• pkg/toolsets/openshift/ztp/policy_diagnose.go — new file with prompt definition, data-fetching helpers, and investigation guide builder
• pkg/toolsets/openshift/toolset.go — register ZTP prompts in the OpenShift toolset

Test plan

• Verify prompt registration with ztp-policy-diagnose name
• Test prompt handler with a NonCompliant ACM policy
• Validate placement data and ArgoCD application fetching
• Confirm investigation guide output includes all diagnostic levels

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: edcdavid
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