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Update MergeRequestDiffCommit creation to set project_id column

Eugenia Grieffrequested to merge
553318-set-project-id-on-merge-request-diff-commits into master

What does this MR do and why?

Ensure that the project_id column is properly set when creating MergeRequestDiffCommit records, both in bulk creation and individual record creation during imports.

This change is necessary preparation for the upcoming new merge_request_diff_commits table, which will be partitioned by project_id and thus requires this column to be populated (see https://gitlab.com/gitlab-org/architecture/merge-request-diff-commits-deduplication/-/blob/main/README.md#create-new-partitioned-merge_request_diff_commits-table for more details).

This change is introduced behind the feature flag merge_request_diff_commits_partition (rollout issue: https://gitlab.com/gitlab-org/gitlab/-/issues/528421).

References

Related to #553318

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Edited by Eugenia Grieff

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