Closing ConPty terminal session with constant active console output randomly blocks AppService to send messages between UWP and SystemTray.

[maxhora]

Repro steps:

• Open five or more cmd.exe sessions and run dir /s to list recursively all files in directory with huge amount of files.
• Start closing sessions one be one and check that Fluent can accept new user input after closing of each session.
• Issue: Closing of tab with active console output printing causes blocking AppService to send and receive any messages between UWP and SystemTray.

Before the recent change https://github.com/felixse/FluentTerminal/pull/715/files#diff-8d54eec5b0b0d0a282e25b2f632658d4R25 sending of messages between UWP and SystemTray was blocked during all 100% tries to close the terminal session with active console output.

cc: @mjs @felixse

[maxhora]

It seems call of ClosePseudoConsole causes hanging behavior.