storage: Unified overview panel

[mvollmer]

See #16440

Demos:

• https://www.youtube.com/watch?v=H0awIn4noo8
• https://www.youtube.com/watch?v=X0YWdGPAoyQ
• https://www.youtube.com/watch?v=C_Za2j5u0AM

Todo

• LVM2 thin pools
• iSCSI sessions
• ...

Polish

• Use Stratis pool names in the breadcrumb instead of UUID
• Don't say "Stratis filesystem" when listing them for a pool
• Navigation after deleting things

Notes

• We need to handle "too many" rows on the overview. We can cut them off like we do with the "Drives" panel and show a "Show all NNN rows" button. We can also omit the content rows (filesystems, etc), and make them expandable.
• Sorting like with the Filesystems panel would be really nice. How do we handle the hierachy?
• Top-level things that have content directly on them are a bit confusing, like a drive or loop back device that directly has a filesystem on it. Technically it makes sense to have two rows for them, one of type "Drive", the other of type "xfs Filesystem". But in the users mind, both rows represent the same object, so it is maybe confusing to see two of them... hmm.
• We should be able to add and remove physical volumes from vgroups already on the overview, but I think we need to change the approach for this. Instead of hanging the actions on the volume group, they should be on the block devices that will become/are the physical volumes. So this should probably be a followup.
• We should (finally) distinguish between "empty" and "unrecognized".

[github-advanced-security]

CodeQL found more than 10 potential problems in the proposed changes. Check the Files changed tab for more details.

[jelly]

Feedback for the last demo:

overview

The overview page is very extensive, maybe a bit too much data is shown. If I want to find information about my system's disks I usually look at fdisk -l in a terminal. Everything important is highlighted in bold white letters with the device name and size being prominently displayed. For me that works quite well or I got used to it, but I think I identify disks by device name and size (then again I don't have too many disks installed anywhere).

For reference, gnome disks seems to do the same:

However, I believe there is work being done on re-designing gnome disks. So maybe this design can also serve as some inspiration.

empty vs unrecognized

Regarding unrecognized data, I agree that the current implementation can be a bit confusing. We should probably not show empty disks as that now seems to clutter the UI. And formalize if it will be "free" or "udisks does not know how to deal with fancy log based FS XYZ".

actions

I think we need to improve the discoverability of actions such as making a stratis pool, RAID area. Maybe instead of a kebab this should be a dropdown or Menu? @garrett probably can provide a better suggestion, but I think overall it is not very easy for someone new to find that in the current design.

breadcrumbs

When you click on:

Should it not show: "raid array -> $raid member" instead of overview -> /dev/foo?

[mvollmer]

Continued in #19472