Revert/2037 unassign

[WillemZeiler]

PR Description:

To Revert #2037 (until Laszlo and I can fix it) back to the original/working version. Following actions have been taken:

• Delete unassign-stale.yml
• Revert pr-auto-unassign-stale.yml

Pull Request Checklist

Overview

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• I have read and understood the CONTRIBUTING.md guidelines
• My pull request has a descriptive title that accurately reflects the changes and the description has been filled in above.
• I've included only files relevant to the changes described in the PR title and description
• I've created a new branch in my forked repository for this contribution

Code Quality

• My code is relevant to ServiceNow developers
• My code snippets expand meaningfully on official ServiceNow documentation (if applicable)
• I've disclosed use of ES2021 features (if applicable)
• I've tested my code snippets in a ServiceNow environment (where possible)

Repository Structure Compliance

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