test(e2e): fix unsable CORS cases

[chenjiahan]

Summary

The CORS e2e cases are unstable in the Windows CI:

    Error: apiRequestContext.get: connect ECONNREFUSED ::1:24257
    Call log:
      - → GET http://localhost:24257/
      -   user-agent: Playwright/1.44.1 (x64; windows 10.0) node/22.12 CI/1
      -   accept: */*
      -   accept-encoding: gzip,deflate,br


        at D:\a\rsbuild\rsbuild\e2e\apiRequestContext.get: connect ECONNREFUSED ::1:24257
        at D:\a\rsbuild\rsbuild\e2e\cases\server\cors\index.test.ts:45:34

Possible solution: https://stackoverflow.com/questions/74567328/api-get-request-test-using-playwright

Related Links

https://github.com/web-infra-dev/rsbuild/actions/runs/12328244091/job/34411201012?pr=4194#step:7:1838

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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