This commit adds improved logging for backend plugins in Cura. Now,
each time a plugin is started, an info log is generated with the used
command.
All plugin output will also be logged to a separate file for easier
debugging. Additionally, a cleanup operation has been added to remove
existing plugin logs before generating a new one, to prevent the file
size from getting too large.
Contributes to CURA-11064
e9f316d5d9