Ports:
- https://github.com/microsoft/playwright/commit/a8d80621b22b62fcae5135860fd666f05010e927 (feat(chromium): large file uploads (#12860))
- https://github.com/microsoft/playwright/commit/b0103566c980b35fbc5c0b10f253eb8442f08062 (fix(addInitScript): tolerate trailing comments (#13275))

Fixes https://github.com/microsoft/playwright-python/issues/1211