Add support for running lightbulbs even when not fully loaded.

[CyrusNajmabadi]

We used to have this block as we could not actually make changes to the workspace while it was loading. Specifically, any application of the fix was normally doomed to fail as the workspace version would have changed out from underneath us, and we would immediately bail.

That restriction was lifted a long time ago. Now, lightbulbs can apply to the workspace, as long as the file contents of the file they are applying to has not changed. As such, this restriciton can be removed.

This is also really desirable as we have a lot of high-pri fixers taht you want to run, even if things like project restore haven't happened yet. For example, imagine this scenario:

1. You do a large git operation, changing tons of files.
2. A bunch of files have merge conflicts in them.
3. You open VS to go fix the merge conflicts.
4. You are blocked on that because a project-system restore needs to happen first, despite us having the information necessary to add the lightbulb actions to fix merge conflicts.