Fix modal launch no longer showing progress (#2168)

This was a side-effect of #2030, it turned off all the CLI output for modal launch. Actually not bad, since it's cleaner, but it also shuts off image build progress which is not ideal since it just looks like it's frozen to users.

modal/cli/launch.py

@@ -8,6 +8,7 @@
 
 from typer import Typer
 
+from .._output import enable_output
 from ..app import App
 from ..exception import _CliUserExecutionError
 from ..runner import run_app
@@ -35,14 +36,15 @@ def _launch_program(name: str, filename: str, args: Dict[str, Any]) -> None:
     # `launch/` scripts must have a `local_entrypoint()` with no args, for simplicity here.
     func = entrypoint.info.raw_f
     isasync = inspect.iscoroutinefunction(func)
-    with run_app(app):
-        try:
-            if isasync:
-                asyncio.run(func())
-            else:
-                func()
-        except Exception as exc:
-            raise _CliUserExecutionError(inspect.getsourcefile(func)) from exc
+    with enable_output():
+        with run_app(app):
+            try:
+                if isasync:
+                    asyncio.run(func())
+                else:
+                    func()
+            except Exception as exc:
+                raise _CliUserExecutionError(inspect.getsourcefile(func)) from exc
 
 
 @launch_cli.command(name="jupyter", help="Start Jupyter Lab on Modal.")