Update codeowners for container ecosystem and co-own autoscaling

[khewonc]

What does this PR do?

Update codeowners:

• container-ecosystem -> container-ecosystem and container-platform
• co-own autoscaling files to unblock autoscaling PRs on container-platform/ecosystem review

Motivation

What inspired you to submit this pull request?

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

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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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.29%. Comparing base (960eb2b) to head (ac71f33).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2622   +/-   ##
=======================================
  Coverage   38.29%   38.29%           
=======================================
  Files         305      305           
  Lines       26301    26301           
=======================================
  Hits        10073    10073           
  Misses      15463    15463           
  Partials      765      765           

Flag	Coverage Δ
unittests	38.29% <ø> (ø)

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