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Enable `ensure_lfs_object_project_uniqueness` FF by default

Javiera Tapia requested to merge 472750-feature-flag-rollout-of-ensure_lfs_object_project_uniqueness into master

What does this MR do and why?

This MR enables the ensure_lfs_object_project_uniqueness FF by default. The feature introduced uses an explicit locking mechanism (advisory lock) in the lfs_object_project model, executed on every record creation. A new callback will take this advisory lock and affect the 3 column values (lfs_object_id, project_id, and repository_type) if they are present.

We want to deduplicate the lfs_objects_projects table by lfs_object_id, project_id, and repository_type. To achieve this, we have !154323 (merged), which creates a batched background migration. However, during the deduplication, we should also avoid creating new duplicates in the lfs_objects_projects table.

The monitoring process can be found in #472750 (closed) and !159264 (comment 2032352722)

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Related to #472750 (closed)

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