Remove jaeger from approval-voting and approval-distribution (#5830)
Jaeger spans were not usable for debugging, see
https://github.com/paritytech/polkadot-sdk/issues/4995, but we pay a
price in CPU cost, subsystem-benchmarks show this brings a reduction of
about 10-15% in CPU usage per subsystem, so remove it.
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Signed-off-by: Alexandru Gheorghe <[email protected]>