Extend lizard's storage capacity

Originally created by @intrigeri on #9399 (Redmine)

lizard’s VG is almost fully allocated, and I could find no obvious waste of allocated but unused disk space on the VMs (the LV for nightly built ISOs has ~50GB free, but once we build all active branches it’ll quickly be filled). We should thus extend its storage capacity.

Subtasks

• tails#9400 (closed)
• tails#9551 (closed)
• tails#9638 (closed)

Related issues

• Related to #10396 (closed)