GitLab's contributions to Git 2.44.0

What this post added

This post details GitLab's contributions to Git 2.44.0, including the upstreaming of `git-replay` for in-memory rebasing in bare repositories, improvements to commit-graph object existence checks to mitigate performance regressions, and significant work on preparing Git for a new 'reftable' ref backend by refactoring internal Git structures and improving the reftable library.