Use DD_TRACE_DEBUG as telemetry key for golang, instead of trace_debug_enabled

[mtoffl01]

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Motivation

dd-trace-go will report configuration to telemetry by their env var names, as of: https://github.com/DataDog/dd-trace-go/pull/4064

Changes

Changes telemetry mappings for trace_debug_enabled to "DD_TRACE_DEBUG" for golang, as of >v2.4.0

Workflow

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Reviewer checklist

• [ ] If PR title starts with [<language>], double-check that only <language> is impacted by the change
• [ ] No system-tests internal is modified. Otherwise, I have the approval from R&P team
• [ ] A docker base image is modified?
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• [ ] A scenario is added (or removed)?
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