Merge duplicate logic of NoSuchProcess detection #136
Description
We have 2 different implementations that detect a "NoSuchProcess" state when reading ELF files of processes - https://github.com/Granulate/granulate-utils/blob/ddd5f79b2b7683af431c5b592f548fe6eff38c28/granulate_utils/linux/elf.py#L24 and https://github.com/Granulate/granulate-utils/blob/ddd5f79b2b7683af431c5b592f548fe6eff38c28/granulate_utils/linux/process.py#L122.
Personally I prefer the latter, and it seems more complete. Let's remove either and fix all sites to use a single one.