Depicate S3 UserAgent Parameter
This was introduced as part of 2dc1af12 It is not documented or used by other drivers.
Additionally, the logic around this is the only other place besides the proxy that the registry/client
package is used: https://gitlab.com/gitlab-org/container-registry/-/blob/master/registry/storage/driver/s3-aws/s3.go#L554. Removing this option would also allow us to remove that package.
Edited by Hayley Swimelar