Don't send x-ray trace metadata for when x-ray has filtered trace #193
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What does this PR do?
When writing the datadog metadata subsegment to x-ray, check the trace hasn't already been sampled.
Motivation
Prevents sending redundant traces to x-ray in the case where user's have at some point turned on active tracing to their function.
Testing Guidelines
I added a unit test, and tested this manually.
Additional Notes
Types of Changes
Check all that apply