Many e2e tests failing with loop device errors

[DrDaveD]

The last few days we have been seeing a lot more apptainer e2e failures with loop device errors, for example in #1185 run 5, with messages for example like

FATAL:   container creation failed: mount hook function failure: mount /proc/self/fd/3->/usr/local/var/apptainer/mnt/session/rootfs error: while mounting image /proc/self/fd/3: failed to find loop device: could not attach image file to loop device: failed to attach loop device: could not open /dev/loop9: no such device or address

This may be related to the problem found in sylabs/singularity#1499 and also reported at #1258, except the error message is different, apptainer is already using /dev/loop-control so the solution provided by sylabs does not apply, and the apptainer e2e tests run on ubuntu 22, not ubuntu 20.

[DrDaveD]

There are also messages like

FATAL:   container creation failed: mount /proc/self/fd/3->/var/lib/singularity/mnt/session/rootfs error: while mounting image /proc/self/fd/3: failed to find loop device: could not attach image file to loop device: no loop devices available

for example in #1185 run 7.