next.js

7a2f4ad1 - Type-check `run-tests.js` and remove unused `related` flag (#88433)

Type-check `run-tests.js` and remove unused `related` flag (#88433) The file already had the `@ts-check` directive, so the IDE did show errors in that file. But since it was not included in the root `tsconfig.json`, those errors were not reported during CI runs. One issue found this way was that the `related` flag was defined but never used. The referenced script was removed in #67644.