fix(core): server runtime captureException event level undefined

[Zih0]

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I found sentry/browser captureException sets the level of the event to error,
but server runtime captureException don't set event level. Closes https://github.com/getsentry/sentry-javascript/issues/10588

[Zih0]

@Lms24 I updated test snapshot. But, the filename and lineno have also been changed, is that okay?