chore: update repo ownership

[shollyman]

This PR migrates admin ownership form the api-bigquery team to the python language team.

[gemini-code-assist]

Summary of Changes

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This pull request systematically updates the administrative ownership of the repository. It reassigns various responsibilities, including code ownership, issue assignment, and pull request assignment, from the api-bigquery team to the python-core-client-libraries team across key configuration files. This ensures that the correct team is now responsible for maintaining and reviewing changes within this repository.

Highlights

• CODEOWNERS Update: The default and samples code ownership has been transferred from the @googleapis/api-bigquery team to the @googleapis/python-core-client-libraries team in the .github/CODEOWNERS file.
• Blunderbuss Configuration Change: The blunderbuss.yml file has been updated to assign issues and pull requests to googleapis/python-core-client-libraries instead of googleapis/api-bigquery.
• Repository Metadata Ownership: The codeowner_team field in .repo-metadata.json has been updated to reflect the new ownership, changing 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 ownership from the api-bigquery team to the python-core-client-libraries team. The changes are consistently applied across .github/CODEOWNERS, .github/blunderbuss.yml, and .repo-metadata.json. The changes correctly reflect the intended ownership transfer and appear to be complete and correct.