Update provider metadata to skip Airflow 2 for post-May 2025 releases (#62801)

Regenerated provider_metadata.json after the Airflow 2 constraint
skipping change. Providers released after May 2025 are now associated
with Airflow 3.x versions instead of 2.x. Also picks up newly
released provider versions.

Also adds CODEOWNERS entry for generated/provider_metadata.json.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>