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 centralizes the ownership and routing for this repository under the Python language team. It systematically replaces references to the api-bigquery team with the python-core-client-libraries team across key configuration files, ensuring that code ownership, issue assignment, and pull request routing are aligned with the new team structure.

Highlights

• CODEOWNERS Update: The .github/CODEOWNERS file has been updated to replace @googleapis/api-bigquery with @googleapis/python-core-client-libraries as a default owner for the repository and its samples.
• Blunderbuss Configuration: The .github/blunderbuss.yml file, which manages automatic issue and PR assignments, has been modified to assign issues and PRs to @googleapis/python-core-client-libraries instead of @googleapis/api-bigquery.
• Metadata Change: The .repo-metadata.json file's codeowner_team entry has been updated to reflect the new ownership, switching from @googleapis/api-bigquery to @googleapis/python-core-client-libraries.

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[gemini-code-assist]

Code Review

This pull request updates the repository's ownership and issue routing configurations. The changes correctly replace the api-bigquery team with the python-core-client-libraries team. These modifications are consistently applied across .repo-metadata.json and the corresponding auto-generated files, .github/CODEOWNERS and .github/blunderbuss.yml. The changes appear correct and align with the stated goal of transferring ownership.

[chalmerlowe]

LGTM