Rename integrations-tools-and-libraries to api-clients in CODEOWNERS

[tim-chaplin-dd]

Cleanup from a team rename that already went into effect in Workday. The new team has the same members as the old one, plus managers:

https://github.com/orgs/DataDog/teams/integrations-tools-and-libraries https://github.com/orgs/DataDog/teams/api-clients

Also updates baklava to the current team, documentation.

APITL-857

[github-actions[bot]]

This issue has been automatically marked as stale because it has not had activity in the last 30 days. Note that the issue will not be automatically closed, but this notification will remind us to investigate why there's been inactivity.