next.js

b0aeccca - Allow filtering individual test cases inside test files (#55786)

Allow filtering individual test cases inside test files (#55786) ### What? Updates `run-test.js` to allow running individual test cases inside a test file. ### Why? So that we can dramatically increase Turbopack's test coverage. Turbopack has implemented most (but not all) necessary features from the webpack bundles. But a single failing test case would prevent us from running any case inside a test file. With case filtering, we're able to run the cases we know will pass and prevent regressions on those. ### How? Case filtering is only exposed via the `NEXT_EXTERNAL_TESTS_FILTERS` ENV, which points to a JSON file containing a map of test files with the test cases inside those files that are known to pass. The known-passing test cases can be updated after Turbopack's daily integration test run by running `test/build-turbopack-tests-manifest.js`, which will update the `test/turbopack-tests-manifest.json` manifest. Closes WEB-1640 Co-authored-by: Tobias Koppers <1365881+sokra@users.noreply.github.com>