Updates CODEOWNERS for agent-core -> agent-metrics logs and baklava -> documentation

[scottopell]

What does this PR do?

Updates CODEOWNERS file with correct team references

Description of the Change

agent-core no longer exists and the dogstatsd bits should be owned by @DataDog/agent-metrics-logs I believe baklava is an old name for @DataDog/documentation

Additional Notes

Release Notes

Review checklist (to be filled by reviewers)

• [ ] Feature or bug fix MUST have appropriate tests (unit, integration, etc...)
• [ ] PR title must be written as a CHANGELOG entry (see why)
• [ ] Files changes must correspond to the primary purpose of the PR as described in the title (small unrelated changes should have their own PR)
• [ ] PR must have one changelog/ label attached. If applicable it should have the backward-incompatible label attached.
• [ ] PR should not have do-not-merge/ label attached.
• [ ] If Applicable, issue must have kind/ and severity/ labels attached at least.

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