[Bug 1989198] Re: Snaps info pre-fetching seems broken

[Olivier Gayot]

I think this got broken as part of this patch:

https://github.com/canonical/subiquity/commit/ee528fe6a

and more specifically:

```
-            task = self.tasks[None] = schedule_task(self._load_list())
-            await task
+            task = self.tasks[None] = SingleInstanceTask(self._load_list, propagate_errors=False)
+            task.start_sync()
```

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https://bugs.launchpad.net/bugs/1989198

Title:
  Snaps info pre-fetching seems broken

Status in subiquity package in Ubuntu:
  New

Bug description:
  It seems that we have a mechanism to pre-fetch information about the
  snaps available. My understanding is that it impacts how fast the
  screen shows the information about a specific snap when the user
  presses enter on the snap list view.

  However, in practice I always get the following debug log, which seems
  to indicate that we did not pre-fetch any snap info.

  2022-09-09 13:09:46,158 DEBUG subiquity.server.controllers.snaplist:70
  fetched list of 0 snaps

  The code does this:

              task = self.tasks[None] = \
                      SingleInstanceTask(self._load_list, propagate_errors=False)
              task.start_sync()
              self.pending_snaps = self.model.get_snap_list()
              log.debug("fetched list of %s snaps", len(self.pending_snaps))

  and it feels like we should wait for the task to complete before
  calling self.model.get_snap_list().

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