Cleanup disposable on failed startup

On "cleanup()" of a disposable with "auto_cleanup" enabled, if the state
is:

- Running: "_auto_cleanup" is called by the event "domain-shutdown" and
  not on "cleanup()", to avoid recalling it which would cause problems;
- Halted: "_auto_cleanup" should be called if domain is not running, but
  that check is unreliable due to many moving parts, so "DispVM.start"
  should contain a "cleanup(force=True)" because in that case, we are
  sure to certain degree that it works, per my tests.

Bug introduced on commit f1cbf21, which
did not enforce "_auto_cleanup" on "DispVM.start"

For: #748
Fixes: QubesOS/qubes-issues#10928

Author: ben-grande

qubes/vm/dispvm.py

@@ -1011,7 +1011,7 @@ async def start(self, **kwargs):
             await super().start(**kwargs)
         except:
             # Cleanup also on failed startup
-            await self.cleanup()
+            await self.cleanup(force=True)
             raise
 
     def create_qdb_entries(self) -> None: