Resolve "Pytest-redis dependency for bec_lib" + "rename bec_client to bec_ipython_client"
Description
This MR moves one of the 2 pytest plugins (the one for e-2-e fixtures) to bec_client
instead of bec_lib
.
Then, it adds more fixtures to be shared by BEC tests in order to deal with the test yaml config file and
to not duplicate code for DeviceManager
mockup.
Finally it renames bec_client
to bec_ipython_client
.
Closes #255 #260 (closed)