Add use-pr-linker workflow to auto-link PRs to issues

[Ivanmeneges]

Summary

Adds use-pr-linker.yml workflow that calls the reusable PR-to-issue linker from mosip/kattu (@develop).

Notes

• Requires ACTION_PAT repository secret to be configured.
• Target branch: release-1.4.0-ES.

[coderabbitai]

Caution

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch add/use-pr-linker-workflow-release-1.4.0-ES

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