* Force `Promise.allSettled` polyfill
`Promise.allSettled` is required by `pdf.js`, but the polyfill is not available in the bundle. This forces babel to include the polyfill without having to process `pdf.js` with webpack/babel, which causes issues loading documents.
* Updated core.js version for test config
GitOrigin-RevId: 981da187352ffc8c59cb77ba55a0a9643bd7cc9a