chore: update ownership/routing for repo

[shollyman]

This PR effectively moves ownership for this repo to the python language
team, and removes api-bigquery as the defacto code owner.

[gemini-code-assist]

Summary of Changes

Hello @shollyman, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request reassigns the primary ownership and routing for the repository from the api-bigquery team to the python-core-client-libraries team. This change ensures that issues and pull requests are automatically directed to the correct team for review and management, streamlining the workflow for the Python language team and clarifying responsibilities.

Highlights

• Code Ownership Transfer: The primary ownership for this repository has been transferred from the api-bigquery team to the python-core-client-libraries team.
• Automated Assignment Updates: The Blunderbuss configuration has been updated to reflect the new ownership, ensuring that issues and pull requests are automatically assigned to the correct Python language team.
• Metadata Alignment: The repository metadata has been adjusted to align the codeowner_team field with the new Python core client libraries team.

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[gemini-code-assist]

Code Review

This pull request updates the repository ownership across several configuration files, changing the owner from @googleapis/api-bigquery to @googleapis/python-core-client-libraries. The changes in .repo-metadata.json and .github/blunderbuss.yml are correct. In .github/CODEOWNERS, while the owner is updated, a related comment has become outdated. I've left a comment to address this for better code maintainability.

[chalmerlowe]

LGTM