Add apm non local traffic env var to local service

[khewonc]

What does this PR do?

Merge after #3183

Add DD_APM_NON_LOCAL_TRAFFIC env var to local service. Ensures the config is there even if the agent image's default datadog.yaml from k8s is overridden with a custom file

Motivation

https://datadoghq.atlassian.net/browse/CONTP-1756

Additional Notes

Anything else we should know when reviewing?

Minimum Agent Versions

Are there minimum versions of the Datadog Agent and/or Cluster Agent required?

• Agent: vX.Y.Z
• Cluster Agent: vX.Y.Z

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Checklist

• PR has at least one valid label: bug, enhancement, refactoring, documentation, tooling, and/or dependencies
• PR has a milestone or the qa/skip-qa label
• All commits are signed (see: signing commits)

[datadog-datadog-prod-us1]

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🛑 Gate Violations

🎯 1 Code Coverage issue detected

A Patch coverage percentage gate may be blocking this PR.

• Patch coverage: 30.57% (threshold: 80.00%)

ℹ️ Info

🎯 Code Coverage (details)
• Patch Coverage: 30.57%
• Overall Coverage: 44.92% (-0.18%)

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[khewonc]

closing in favor of #3224