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perf(web): draw server trace ids from Math.random (#4115)

The W3C traceparent a render mints when the request carries none took two
crypto.getRandomValues calls per render, each through Node's
RandomBytesJob. Trace and span ids need to be unique and well spread, not
unguessable, which is also OpenTelemetry's default IdGenerator; four
Math.random words cost under a microsecond. Warm, the streamed shell's
CPU goes 100.9 -> 97.5 us per render (-3%) on the Octane streaming-ssr
fixture; the cold profile that found it had charged it 12 us, inflated
like everything else by the idle-parked core that suite measures on.
Zero size change (the renderToString floor moves -1 B minified).

Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

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