omdb db zpool and crucible-dataset subcommands should ignore deleted zpools

[askfongjojo]

I was trying to work around #7962 temporarily by manually setting the time_deleted field to non-NULL for a zpool in an expunged disk.

root@[fd00:1122:3344:105::3]:32221/omicron> update zpool set time_deleted = time_modified where id = '3af01cc4-1f16-47d9-a489-abafcb91c2db';
UPDATE 1


Time: 3ms total (execution 3ms / network 0ms)

root@[fd00:1122:3344:105::3]:32221/omicron> select * from zpool where id = '3af01cc4-1f16-47d9-a489-abafcb91c2db';
                   id                  |         time_created          |         time_modified         |         time_deleted          | rcgen |               sled_id                |           physical_disk_id           | control_plane_storage_buffer
---------------------------------------+-------------------------------+-------------------------------+-------------------------------+-------+--------------------------------------+--------------------------------------+-------------------------------
  3af01cc4-1f16-47d9-a489-abafcb91c2db | 2023-08-30 18:57:52.826594+00 | 2024-03-27 21:18:20.842573+00 | 2024-03-27 21:18:20.842573+00 |     4 | 0c7011f7-a4bf-4daf-90cc-1c2410103300 | 0bffef3c-56b1-4b01-b897-161bbf766bea |                 268435456000
(1 row)

But that still doesn't allow the omdb db zpool and omdb db crucible-dataset commands to work. They still complain about the zpool on an expunged disk:

root@oxz_switch0:~# omdb db zpool list
Error: zpool 7ab10d7d-2b90-4080-ad3c-9b4187d4e122 not found in inventory!

root@oxz_switch0:~# omdb db crucible-dataset list
Error: zpool 3af01cc4-1f16-47d9-a489-abafcb91c2db not found!