test: bump disk sizes for some test cases

test: bump disk sizes for some test cases

In my testing I switched building my locally run CI integration tests to
ArchLinux and realized that for that the default sizes don't work
anymore, the images are larger than the space allocated. Let's bump the
size by 50% for the relevant disk images.

(cherry picked from commit ab89fad427b7bee6f3102708bf8bdf15fd607d9e)
(cherry picked from commit b1ce991244425abe76c3a217af4b271c437b997f)
(cherry picked from commit 6a8f10b9557eeaa94175dcf93ba9e1811badfbef)