prober: record total bytes transferred in DERP bandwidth probes

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This will enable Prometheus queries to look at the bandwidth over time windows,
for example 'increase(derp_bw_bytes_total)[1h] / increase(derp_bw_transfer_time_seconds_total)[1h]'.

Fixes commit a51672cafd.

Updates tailscale/corp#25503

Signed-off-by: Percy Wegmann <percy@tailscale.com>

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