Reduce the load on GitLab Gitaly with bundle URI

What this post added

Introduced and detailed the Bundle URI feature for Gitaly, enabling Git to pre-download bundled repositories from object storage during clones. This significantly reduces load on Gitaly servers, particularly for large monorepos, by offloading the initial download of repository objects. The post outlines configuration steps for cloud buckets, feature flags, manual and auto-generation of bundles, and how to utilize Bundle URI for both terminal and CI/CD pipeline clones, including necessary GitLab Runner helper-image updates and feature flag configurations.