ref(o11y): Modify sample_rate header in MultiplexingTransport#120306
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sample_rate header in MultiplexingTransport
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sample_rate header in MultiplexingTransportsample_rate header in MultiplexingTransport
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Telemetry sent to s4s2 is sampled at 5% and independently of telemetry sent to SaaS. Adjust the sample rate header so that extrapolation in s4s2 works with the effective sample rate of telemetry.