refactor(memory_sync): convert ClickUp to the generic sync orchestrator (Refs #3333, stacked on #3860) - #3873

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: dorny/paths-filter@v3. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/