Integration tests leave stray files/directories in $TMPDIR

[nagisa]

Description

Running a

find /tmp/ -iname '.tmp*' | wc -l
just nextest-integration nightly --config fail-fast=false
find /tmp/ -iname '.tmp*' | wc -l

Will output something like

243
572

Even if the test run is otherwise successful. Moreover some of these directories end up non-empty, thus consuming an usually quite limited space on this mount.