Branching datasets

Description

• detect pools on datasets setup
• enable branching for all new clones (branch main by default)
• rename clone containers (use cloneID) and dataset paths (both snapshots and clones)
• support for multiple snapshots from the same clone
• adjust detection of idle clones
• fix removing branches and snapshots
• fix issues after merging the master branch

Due to significant renaming, issues may occur in other features not described in the list of changes

Related issue

Examples

Checklist

• MR description has been reviewed
• MR changes are functionally tested
• MR does NOT have API/CLI changes OR there are API/CLI changes and they have been reviewed & DOCS ARE ADJUSTED (reference doc, etc)
• MR does NOT have UI changes OR there are UI changes and they have been reviewed & UX IS REVIEWED