Backport filtering objects in git-cat-file(1) and git bundle create perf optimizations to Git 2.49

We recently merged two important perf optimizations to next

• Allow filtering objects in `git-cat-file(1)` (#495 - closed) • Patrick Steinhardt • Git 2.50
• Generating bundles with many references has non... (#488 - closed) • Karthik Nayak • Git 2.50

Let's backport these changes to Git 2.49 so we can already start using these optimizations in Gitaly.

Also track the improvements in Gitaly because of these optimizations, potentially with an announcement in the necessary channels.