[cts] Remove compression when we measure the file size

Incfs disk allocation test needs to estimate the expected size
needed for the file, and enabling page compression messes up
with that - on 16k devices compression is more efficient as
more compressed 4k pages fit into a single 16k one, causing
the estimation to be way off.

With no compression it's all working as expected

+ Rename a few variables to be more clear

Bug: 414454999
Test: atest PackageManagerShellCommandIncrementalTest
Flag: EXEMPT test fix
Change-Id: I381265dc6f248f61b172c9eb2e076d371a63668e
1 file changed