Merge branch...

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

Add and backfill project_id for incident_management_pending_alert_escalations

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/166816



Merged-by: Omar Qunsul <oqunsul@gitlab.com>
Approved-by: Alex Buijs <abuijs@gitlab.com>
Approved-by: Thong Kuah <tkuah@gitlab.com>
Approved-by: Omar Qunsul <oqunsul@gitlab.com>
Reviewed-by: Terri Chu <tchu@gitlab.com>
Reviewed-by: Omar Qunsul <oqunsul@gitlab.com>
Co-authored-by: Shubham Kumar <shukumar@gitlab.com>