production/git-loader: Attempt to progressively downscale the loaders when the queue is nearly empty

With the default configuration to 10, a massive downscale is performed when the number of message in the queue is < 640 (64 pods)

By increasing the value to 200, the downscale should progressively start when the queue length is < 12800 with a couple of pods.

At worst, only a couple of pods should be removed and restarted 300s later At best, the consumption should be more stable.