test(core): wait for debuglink task before restarting THP event loop

[no changelog]

Author: romanz

core/src/trezor/wire/__init__.py

@@ -110,6 +110,10 @@ async def handle_session(iface: WireInterface) -> None:
         finally:
             # Wait for all active workflows to finish.
             await workflow.join_all()
+            if __debug__:
+                import apps.debug
+
+                await apps.debug.close_session()
             loop.clear()
 
 else: