test: make babel test pass under Node.js 24

[mxschmitt]

(node:34672) ExperimentalWarning: Type Stripping is an experimental feature and might change at any time
    (Use `node --trace-warnings ...` to show where the warning was created)
    SyntaxError: TypeScript enum is not supported in strip-only mode

https://github.com/microsoft/playwright/issues/36404

[github-actions[bot]]

Test results for "tests 1"

6 flaky

:warning: [chromium-library] › library/popup.spec.ts:258:3 › should not throw when click closes popup @chromium-ubuntu-22.04-node18
:warning: [firefox-library] › library/inspector/cli-codegen-1.spec.ts:986:7 › cli codegen › should not throw csp directive violation errors @firefox-ubuntu-22.04-node18
:warning: [playwright-test] › ui-mode-test-watch.spec.ts:145:5 › should watch all @ubuntu-latest-node20-1
:warning: [playwright-test] › ui-mode-test-watch.spec.ts:145:5 › should watch all @ubuntu-latest-node22-1
:warning: [webkit-page] › page/page-screenshot.spec.ts:345:5 › page screenshot › should work while navigating @webkit-ubuntu-22.04-node18
:warning: [playwright-test] › ui-mode-test-watch.spec.ts:145:5 › should watch all @windows-latest-node18-1

39454 passed, 823 skipped :heavy_check_mark::heavy_check_mark::heavy_check_mark:

Merge workflow run.