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Set feature flag lfs_auto_link_fork_source to true by default

Stan Hu requested to merge sh-default-lfs_auto_link_fork_source-ff into master

What does this MR do and why?

This sets the feature flag introduced in !75972 (merged) by default. This has been running in production for over a week (#348243 (closed)).

Previously LFS uploads would always have to be reuploaded to a fork even if the parent already had received the LFS file, but this is unnecessary, wasting time and bandwidth. Consider this sequence of events:

  1. Push LFS file test.bin to project A.
  2. Fork project A to project B.
  3. Push LFS file test2.bin to project A.
  4. Push to project B.

When 4 happens, GitLab should be smart enough to realize that if the user has access to the parent project, then we should be able to link the LFS files in A without requesting a reupload of the file.

Relates to #348243 (closed)

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by Stan Hu

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