Test: gracefully killing terminal processes

[meganrogge]

Refs #206607

• [ ] Windows
• [ ] macOS
• [ ] Linux

Complexity: 4

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We’ve added an opt-in setting, terminal.integrated.killGracefully, to cleanly shut down terminal processes, including child processes. This helps avoid orphaned processes, frees up ports, and can reduce the risk of resource leaks.

• To begin, have that setting disabled
• Open a repo with a task or terminal command that uses a port (see example below)
• Run that task or command in the terminal
• Click the trash can to kill the terminal or close VS Code.
• Reopen that repo and rerun the command or task.
• You'll see an error about address in use.
• List all processes using that port (3000 or whatever yours is using): lsof -i :3000
• Run kill -9 PID
• Enable the setting.
• Repeat the above steps. You should not encounter an error - it should run successfully.

Example:

• Open https://github.com/xtermjs/xterm.js
• Run npm i in the terminal
• ctrlCmd+shift+b to start the default build task.
• It launches the demo using a port.