tsc is not resposive to `ctrl-c`

When you run tsc and attempt to interrupt a build it does not respond instead it just complets the build

This is because typescript-go installs [signal handlers](https://github.com/microsoft/typescript-go/blob/8a749379d556f1bb4044218a1f94bc90fbfb6a03/cmd/tsgo/main.go#L28) to propagate sigterm and sigint to the `context.Context` object

However this is not always threaded all the way through the build

I prepared https://github.com/microsoft/typescript-go/pull/4592 to fix this, but the fix is non-trivial

Alternatively should we just _not_ install signal handlers and let normal behavior proceed?