* Fix#3439 Trusted doesn't get saved in Notebooks
The main fix is to add a memento to store trust information. This is only needed for saved files - untitled files are always trusted as the user created them.
On clicking trusted or saving a file, the trusted state is cached. In the future, we will also handle code execution here too by sending notification on snapshot state.
I found issue #5506 during testing - existing issue where we should track trusted state changing on run. In the case all cells are ran, the whole notebook should become trusted.
Finally, I did a decent amount of refactoring to move more logic to the model - removing unnecessary calls from components which duplicated model behavior, moving trust notification to the model or at least the notebook service completely.
Added tests and logging for catch handling
