Backport praefect sub-commands to 14.2

Pavlo Strokovrequested to merge
ps-backport-praefect-cmds into 14-2-stable

This is a backport of the remove-repository, list-untracked-repositories and track-repository praefect sub-commands to 14.2 version.

Part of: #3771 (closed)
Part of: #3792 (closed)
Part of: #3773 (closed)

Changelog: added

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