Improve stability of new CSC eviction test (#8160)
c4fdf09c added a test that now fails with valgrind it fails for two resons: 1) the test samples the used memory and then limits the maxmemory to that value, but it turns out this is not atomic and on slow machines the background cron process that clean out old query buffers reduces the memory so that the setting doesn't cause eviction. 2) the dbsize was tested late, after reading some invalidation messages by that time more and more keys got evicted, partially draining the db. this is not the focus of this fix (still a known limitation) (cherry picked from commit a102b21d)
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