Improve the az upgrade locking

[mikeblakeuk]

az feedback auto-generates most of the information requested below, as of CLI version 2.0.62

Related command
az upgrade

Describe the bug
Terminal spawns the MSI so the MSI locks Python. If you close the terminal window, the installation will stop.

To Reproduce
Upgrade within a terminal

Expected behavior
Install with no locks.

Environment summary
Windows-10-10.0.19043-SP0,
Python 3.10.4
MSI
Windows 10, Terminal, PowerShell

Additional context
none

[yonzhan]

@jiasli for awareness

[in-fke]

This should have tons of votes - happens all the time.