Allow to configure LFS link batch size via environment variable

Vasilii Iakliushinrequested to merge
vi-use-env-for-lfs-batch-size into master

What does this MR do and why?

Based on !152038 (closed). Thank you @cwaninger for your contribution! 🙇

Problem

It's possible to configure MAX_OIDS value for LFS linking, but BATCH_SIZE is hardcoded.

Solution

Define GITLAB_LFS_LINK_BATCH_SIZE environment variable to control the batch size.

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