[backport to release/3.3.x] fix(tracing/propagation): set parent span correctly (#11468) #11648
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backport of #11468
Summary
Fix an issue where the parent span was set incorrectly when the balancer instrumentation was disabled (the parent span ID was set to a temporary balancer span that was never reported).
Checklist
There is a user-facing docs PR against https://github.com/Kong/docs.konghq.com - PUT DOCS PR HEREFull changelog
Issue reference
https://konghq.atlassian.net/browse/KAG-2281
closes #11294