[CONTRIB] Promote ExpectColumnValuesToMatchStrftimeFormat to supported-core - #12009

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/github-script@v7, thollander/actions-comment-pull-request@fabd468d3a1a0b97feee5f6b9e499eab0dd903f6. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/