Test suite: only partially fill memory for userspace processes.
Filling all memory often leads to the VM crashing. So why fill all memory? Back when Tails was 32-bit (or mixed with 64-bit) there were some of uncertainty around the 4 GiB limit, which motivated us to fill a larger region than 4 GiB, so without much thought we might have just gone ahead and filled all of it. But, AFAICT, if we went with the approach I describe above and allocated >4 GiB then the test would still have done what we wanted. In today's fully 64-bit world we have no reason for allocating >4 GiB, so we could go with 128 MiB like the other tests arbitrarily (?) do. Will-fix: #17104
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