Roll out PostUploadPackWithSidechannel

This is the roll-out issue for the use of Gitaly sidechannels to support Git HTTP fetch traffic between Workhorse and Gitaly. For more information about Gitaly sidechannels, see https://gitlab.com/gitlab-org/gitaly/-/blob/master/doc/sidechannel.md.

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• Make sure PostUploadPackWithSidechannel is ignored by apdex alerts gitlab-com/runbooks!3944 (merged)
• Add concurrency limit for PostUploadPackWithSidechannel https://gitlab.com/gitlab-com/gl-infra/chef-repo/-/merge_requests/718 chef-repo!720
• Change issue: roll out in gstg production#5700
• Change issue: roll out in gprd production#5701 for gitlab-org/gitaly, gitlab-org/gitlab and gitlab-com/www-gitlab-com
• Change issue: roll out across all of gprd production#5702
• Change issue: disable pre-clone script on gitlab-org/gitlab production#5708