Remove lfs-check feature flag
What does this MR do and why?
We have it enabled on Sass for a while now. However, it was disabled for some customers because the underlying RPC was slow for some self-managed customers. The LFS check is using an optimized RPC now and we can proceed with enabling the check by default for all customers.
Related issue: Remove `:lfs_check feature` flag (#233550 - closed)
Edited by Igor Drozdov