Build 19002

For general Windows information on build 19002 visit the Windows blog.

• [WSL] Fix issue with handling of some Unicode characters: https://github.com/microsoft/terminal/issues/2770
• [WSL] Fix rare cases where distros could be unregistered if launched immediately after a build-to-build upgrade.
• [WSL] Fix minor issue with wsl.exe --shutdown where instance idle timers were not cancelled.