next.js

9ba29b41 - Revert "Revert "Revert "Revert "Add a --webpack flag and default --turbopack to true (#84216)"""" (#84394)

Revert "Revert "Revert "Revert "Add a --webpack flag and default --turbopack to true (#84216)"""" (#84394) Reverts vercel/next.js#84389 Attempt number 3, #84374 fixed propagation of bundler environment variables to vercel cli operations, to ensure the test configuration is respected. [Deployment Tests Run 1](https://github.com/vercel/next.js/actions/runs/18146684793/job/51649631635). A fair number of failures. [Deployment Tests Run 2](https://github.com/vercel/next.js/actions/runs/18154875270). After #84395. These still have a set of failures, but i confirmed that the deployment builds are running `webpack`. The tests that are failing are related to 'prefetches' (test/e2e/app-dir/segment-cache/prefetch-runtime/prefetch-runtime.test.ts and test/e2e/app-dir/segment-cache/prefetch-layout-sharing/prefetch-layout-sharing.test.ts) and generally the error is a timeout. Recent deployment runs for canary releases are also failing, but on different tests. Trying again after #[84419](https://github.com/vercel/next.js/pull/84419). [Deployment Tests Run 3](https://github.com/vercel/next.js/actions/runs/18173375427). Failures appeared flaky, rerunning failures...