…is no longer available"

A patch that fixes OSError "[WinError 64] The specified network name is no longer available"

(cherry picked from commit 6e7654e)

…le disk space

This commit modifies the function `check_free_space`. The function checks if there is enough free space on the disk by calculating the disk usage of a specified folder. If the available space is less than 100MB, an error message is displayed and Tribler exits. The function also logs the amount of free space when it is sufficient. Additionally, in the `start_gui.py` module, the `check_free_space` function now takes a parameter specifying the root state directory to be checked for free space.

Add test cases for check_free_space

- Added new test cases for the `check_free_space` function to ensure it works correctly when there's sufficient disk space and raises an exception when there's insufficient disk space.
- Also added test cases to check the behavior when there's an ImportError or OSError.

(cherry picked from commit b2bc372)