Add Option to Display Hidden Snapshots in Snapshots List

A current listing of snapshots through the GUI does not show snapshots of hidden directories which were made automatically. These are only visible by running the zfs list -t snapshot command which shows a whole bunch of automatically created snapshots that are now not being cleared up for the “.system” dataset. I would like to be able to delete these through the safety of the GUI rather than risk a typo in the “zfs destroy” command from destroying something unintended.

Impact
I would suggest adding an option to the existing grid configuration to show hidden snapshots (default to false). In this way, it would not impact existing users.

User Story
See above

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