Add replace behavior for fleet remote config

[khewonc]

What does this PR do?

Add replace behavior for fleet remote config

Motivation

https://datadoghq.atlassian.net/browse/CONTP-1933

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
• All commits are signed (see: signing commits)

[datadog-prod-us1-3]

🎯 Code Coverage (details)
• Patch Coverage: 83.33%
• Overall Coverage: 47.51% (+0.09%)

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