Extend lizard's storage capacity

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

#9400 (closed)
#9551 (closed)
#9638 (closed)

Related issues

Related to #10396 (closed)

Original created by @intrigeri on 9399 (Redmine)

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