gitaly-backup: Remove layout arg

Mustafa Bayarrequested to merge
6091-remove-layout-arg into master

What does this MR do and why?

gitaly-backup: Remove layout arg

Since gitaly!8500 (merged) passing the layout arg is no-op and gitaly defaults to using manifest layout. Gitaly will completely remove the layout param but first we need to get rid of its usage in the client.

Changelog: removed

Related to gitaly#6091 (closed)

Edited by Mustafa Bayar

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