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Refactor out test_disk_usage_eviction tenant creation and add a custom case with 4 tenants, 3 made with pgbench scale=1 and 1 made with pgbench scale=4. Because the tenants are created in order of scales [1, 1, 1, 4] this is simple enough to demonstrate the problem with using absolute access times, because on a disk usage based eviction run we will disproportionally target the *first* scale=1 tenant(s), and the later larger tenant does not lose anything. This test is not enough to show the difference between `relative_equal` and `relative_spare` (the fudge factor); much larger scale will be needed for "the large tenant", but that will make debug mode tests slower. Cc: #5304