improve stability of integration tests

[lukas016]

Describe the bug
We have very long time problem with stability of integration tests. It cannot continue this way.
Pls use this issue for collect all failed github actions and we will have to fix it.

Failed github actions

• https://github.com/ironcore-dev/libvirt-provider/actions/runs/8296550240/job/22705779549?pr=196
• https://github.com/ironcore-dev/libvirt-provider/actions/runs/8297576571/attempts/1?pr=228
• https://github.com/ironcore-dev/libvirt-provider/actions/runs/8307260248/job/22736559392#step:7:1

exec tests:

• https://github.com/ironcore-dev/libvirt-provider/actions/runs/8307260248/job/22738268698?pr=222

list tests:

• https://github.com/ironcore-dev/libvirt-provider/actions/runs/8307260248/job/22739085336?pr=222

graceful shutdown tests:

• https://github.com/ironcore-dev/libvirt-provider/actions/runs/8335472419/job/22811023546?pr=236
• https://github.com/ironcore-dev/libvirt-provider/actions/runs/8341724544/job/22828364212?pr=232
• https://github.com/ironcore-dev/libvirt-provider/actions/runs/8387321636/job/22969298248?pr=233
• https://github.com/ironcore-dev/libvirt-provider/actions/runs/8387625062/job/22970168885?pr=233

volume attach test:

• https://github.com/ironcore-dev/libvirt-provider/actions/runs/8355122249/job/22869622208?pr=245

[lukas016]

my notes:

• some machines can be simplified because their whole setup isn't needed for test purpose and it is tested in another test (delete disks, delete network, ...)
• machines use probably wrong image which cannot boot (question is why tests end successfully)
• using ordered decorator can maybe help us improve stability of tests because they can run in random order and tests aren't designed for parallel run

[so-sahu]

We can use this issue to monitor overall stabilization and create smaller PRs to address specific areas. Please feel free to expand the following list to track supporting PRs:

• Extended Duration of Integration Tests Run #242