added env vars + DDA spans

[nlchung]

What does this PR do?

A brief description of the change being made with this pull request.

Motivation

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Additional Notes

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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)

[codecov-commenter]

Codecov Report

❌ Patch coverage is 55.64516% with 55 lines in your changes missing coverage. Please review.
✅ Project coverage is 38.87%. Comparing base (6823e7f) to head (b3e575a).

Files with missing lines	Patch %	Lines
...controller/datadogagent/controller_reconcile_v2.go	53.84%	40 Missing and 14 partials ⚠️
cmd/main.go	0.00%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (55.64%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@               Coverage Diff               @@
##           dd-trace-go    #2744      +/-   ##
===============================================
+ Coverage        38.79%   38.87%   +0.08%     
===============================================
  Files              309      309              
  Lines            26741    26818      +77     
===============================================
+ Hits             10373    10425      +52     
- Misses           15589    15614      +25     
  Partials           779      779              

Flag	Coverage Δ
unittests	38.87% <55.64%> (+0.08%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
internal/controller/datadogagent_controller.go	68.36% <100.00%> (+1.70%)	⬆️
cmd/main.go	6.54% <0.00%> (ø)
...controller/datadogagent/controller_reconcile_v2.go	61.74% <53.84%> (+1.32%)	⬆️

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