Problem/Justification
(What is the problem you are trying to solve with this feature/improvement or why should it be considered?)
If there are excessive snapshots that do not have a destruction date or were not cleaned out properly for whatever reason, they can pile up and potentially be overwhelming to mark for removal as the only way to see the destruction date is to click on a specific snapshot.
Impact
(How is this feature going to impact all TrueNAS users? What are the benefits and advantages? Are there disadvantages?)
Though a potentially small and niche issue, being able to quickly sort by destruction date and show snapshots that do not have one or are way in the past and were not automatically deleted for whatever reason would make correcting the issue much faster and easier than manually clicking on potentially hundreds of snapshots to decide if they need to be manually removed or not, or going nuclear and just deleting them all and risking data loss.
User Story
(Please give a short description on how you envision some user taking advantage of this feature, what are the steps a user will follow to accomplish it)
I and a couple other users had a ton of snapshots with proper destruction dates that were not automatically destroyed for some unknown reason, and I also had an issue where a lot of snapshots were not marked with a destruction date for some other unknown reason despite all of my snapshot tasks having a 1 week lifetime since they day they were created. I ended up doing the nuclear option rather than go though hundreds of snapshots, but if I had a way to sort them so I could quickly and easily identify which ones had no date and also ones with a date long past, I could have deleted those specifically and not had to accept the risk of potentially losing data if something in software or hardware had gone wrong.