Updated `walletInitSteps` and `settingsSteps` properly: `settingsSteps.py` was referring to some `wallet_init_steps` methods but it was not imported. Reorganization and cleanup.
Renamed `startupSteps.py` to `commonInitSteps.py`.
Cleanup `Processes` folder (not used).
Moved `walletInitSteps.py` inside the own suite steps.
Added files flow diagram.
Closes#8353