compat: `glint --build` does not report errors

[runspired]

running either glint (no options) or tsc --build would report errors, but glint --build will silently succeed even if errors occur. It would be great to match behavior, or at least have a flag that allows errors to surface.

[runspired]

just coming back to this cause this has bitten me for about 3 hours worth of time in the last two days alone. Is this a big lift? a small lift? something someone like me that knows fairly little about glint could figure out?

[dfreeman]

I'm not an expert on that particular area of the codebase, but there's a pretty large suite of tests ensuring that glint --build emits errors in a number of different situations, so I can say for certain that whatever you're running into is a bug.