Add basic controller tests for DDAI

[khewonc]

What does this PR do?

• Adds some controller tests for DDAIs
• When a DCA token is set in a DDA, clear the literal token in the DDAI since we create a secret for it
• Add remote config status only when it is non-nil

Motivation

https://datadoghq.atlassian.net/browse/AGENTONB-2486

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

Describe your test plan

Write there any instructions and details you may have to test your PR.

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

[codecov-commenter]

Codecov Report

❌ Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 38.92%. Comparing base (900987e) to head (55e5420).

Files with missing lines	Patch %	Lines
.../controller/datadogagent/testutils/client_utils.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2139      +/-   ##
==========================================
+ Coverage   38.62%   38.92%   +0.30%     
==========================================
  Files         254      254              
  Lines       26025    26029       +4     
==========================================
+ Hits        10051    10132      +81     
+ Misses      15388    15288     -100     
- Partials      586      609      +23     

Flag	Coverage Δ
unittests	38.92% <83.33%> (+0.30%)	⬆️

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

Files with missing lines	Coverage Δ
internal/controller/datadogagent/ddai.go	67.16% <100.00%> (+6.55%)	⬆️
internal/controller/datadogagent/global/utils.go	86.20% <100.00%> (+0.49%)	⬆️
.../controller/datadogagent/testutils/client_utils.go	0.00% <0.00%> (ø)

... and 6 files with indirect coverage changes

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