Add and backfill project_id for p_ci_job_annotations

Max Oreficerequested to merge
morefice/add-sharding-key-p-ci-job-annotations into master

Ref: #463246 (closed)

What does this MR do and why?

This MR adds and backfills project_id for p_ci_job_annotations as this is a requirement for Cells1.0.

We have about ~140K records to update.

Edited by Max Orefice

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