Merge branch 'backfill-desired-sharding-key-small-table-packages_pypi_metadata' into 'master'

Add and backfill project_id for packages_pypi_metadata

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/167608



Merged-by: Omar Qunsul <oqunsul@gitlab.com>
Approved-by: Max Orefice <morefice@gitlab.com>
Approved-by: Dylan Griffith <dyl.griffith@gmail.com>
Approved-by: Adie (she/her) <avpfestin@gitlab.com>
Approved-by: Omar Qunsul <oqunsul@gitlab.com>
Reviewed-by: Max Orefice <morefice@gitlab.com>
Co-authored-by: Shubham Kumar <shukumar@gitlab.com>