This commit adds a new function called `disable_wifi_with_attempts()`
to the `libnm-wifi-utils` C++ library.
The function uses the NetworkManager library to disable WiFi on the
system. The function uses a similar logic to
the `enable_wifi_with_attempts()` function, which waits for the WiFi to
be disabled before returning a result. The function is tested and works
as expected.

Signed-off-by: Kareem Zarka <kareem.zarka@huawei.com>