fix(ci): separate collected resources with YAML document markers

[zakisk]

📝 Description of the Change

Use per-resource kubectl get with --- separators when collecting pipelineruns, repositories, and configmaps in CI log artifacts so each resource is a distinct YAML document.

🔗 Linked GitHub Issue

Fixes #

🧪 Testing Strategy

• Unit tests
• Integration tests
• End-to-end tests
• Manual testing
• Not Applicable

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[gemini-code-assist]

Code Review

This pull request refactors the log collection script hack/gh-workflow-ci.sh to fetch individual Kubernetes resources (pipelineruns, repositories, and configmaps) in loops and write them to YAML files. The review feedback highlights a critical issue: because set -e and set -o pipefail are active, any failure in kubectl get (such as a resource being deleted during collection) will cause the entire script to abort prematurely. It is recommended to handle potential errors gracefully by checking if the resource exists and redirecting stderr.

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