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What does this PR do?

Enables sending trace data in batches by default.

Prior to this change trace data batching could be enabled by setting the DD_JENKINS_ENABLE_TRACES_BATCHING env variable to true.
This was done as a precaution in case batched requests did not work as expected.
Now that they are known to work (there is a customer who has enabled batching), we can enable them by default.

Description of the Change

Alternate Designs

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Review checklist (to be filled by reviewers)

• Feature or bug fix MUST have appropriate tests (unit, integration, etc...)
• PR title must be written as a CHANGELOG entry (see why)
• Files changes must correspond to the primary purpose of the PR as described in the title (small unrelated changes should have their own PR)
• PR must have one changelog/ label attached. If applicable it should have the backward-incompatible label attached.
• PR should not have do-not-merge/ label attached.
• If Applicable, issue must have kind/ and severity/ labels attached at least.