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What does this PR do?
Adjusts x-ray/dd-trace parenting rules, so that when merging is turned on and a dd-trace context is in the incomming message, the dd-trace trace-id is used, and the x-ray parent-id is used.
Motivation
Fixes the flamegraph, so we can have dd-trace -> x-ray(eg apigateway) -> dd-trace parenting relationships.
Testing Guidelines
I've added a unit test, and tested this manually. Integration tests weren't useful because we mask trace-ids.
Additional Notes
Types of Changes
Check all that apply