ui: ceph status: add pg warning state

ui: ceph status: add pg warning state

Like ceph mgr dashboard, we need a warning state.

- set degraded as warning instead working
- set undersized as warning instead error
- rename error as critical
- add "busy" (info-blue) color for working state
- use warning (orange) color for warning state

Signed-off-by: Alexandre Derumier <aderumier@odiso.com>
Tested-By: Aaron Lauterer <a.lauterer@proxmox.com>
Reviewed-By: Aaron Lauterer <a.lauterer@proxmox.com>
 [ TL: fold in CSS class addition ]
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>