AZCLI not honoring the AZURE_CONFIG_DIR env variable on Windows

**Describe the bug**
Since the last few releases of AZCLI, the tool stopped honoring the AZURE_CONFIG_DIR on Windows.
Before the change setting that variable allowed to redirect the .azure directory.
From that change, you now need to reset the HOME variable affecting also other tools.

**To Reproduce**
On Windows, set the AZURE_CONFIG_DIR environment variable, note that is not honored by AZCLI runs.

**Expected behavior**
Restore the previous behavior where the AZURE_CONFIG_DIR is honored on Windows as well.

**Environment summary**
Cmd on Windows.