chore: migrate to serverless onboarding managed team

[ava-silver]

What does this PR do?

Migrates to the managed github team in codeowners: https://github.com/orgs/DataDog/teams?query=serverless-onboarding

Motivation

Testing Guidelines

Additional Notes

Types of Changes

• Bug fix
• New feature
• Breaking change
• Misc (docs, refactoring, dependency upgrade, etc.)

Check all that apply

• This PR's description is comprehensive
• This PR contains breaking changes that are documented in the description
• This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
• This PR impacts documentation, and it has been updated (or a ticket has been logged)
• This PR's changes are covered by the automated tests
• This PR collects user input/sensitive content into Datadog

[ava-silver]

• chore: migrate to serverless onboarding managed team #519 👈 (View in Graphite)
• main

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