Merge branch '502767-correct-backfill-trigger-id-to-p-ci-pipelines' into 'master'

Remove BackfillPCiPipelinesTriggerId

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/175517



Merged-by: Marius Bobin <mbobin@gitlab.com>
Approved-by: Max Orefice <morefice@gitlab.com>
Approved-by: Marius Bobin <mbobin@gitlab.com>
Reviewed-by: Max Orefice <morefice@gitlab.com>
Reviewed-by: Tianwen Chen <tchen@gitlab.com>
Co-authored-by: Tianwen Chen <tchen@gitlab.com>