fix: revive clone feature

[lizable]

This PR revives "clone" feature which was commented out due to timing issue on large vfolder cloning ( > 10GB), which seems to be resolved already.

Checklist: (if applicable)

• Mention to the original issue
• Documentation
• Minimum required manager version
• Specific setting for review (eg., KB link, endpoint or how to setup)
• Minimum requirements to check during review
• Test case(s) to demonstrate the difference of before/after

Tests

• You can see Cloneable icon for each vfolder in Cloneable column, for each row. (check icon will show up only when the vfolder is cloneable.)
• You can change cloneable flag in "Update folder option", which can be triggered when you click "gear" icon in Control column.
• When you try to clone vfolder which has more than 10GB size for total, It do take time but eventually cloning operation will be finished succesfully.

[lizable]

Since clone feature on backend part doesn't support cloning vfolders between different storages yet, therefore this PR will be on hold.