Avoid trace span buffer becoming too large #39609
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Commit Message: Avoid trace span buffer becoming too large

Additional Description:
See istio/istio#55439 (comment) , the sidecar space-inuse flame graph shows sometimes span serialize message grow too large, maybe it's caused by sending span to remote server is too slow. We should avoid this memory growing.
Risk Level:
Testing:
Docs Changes:
Release Notes:
Platform Specific Features: