Allow for filtering notebooks when viewing, specifically forks

[zachperiscopic]

Is your feature request related to a problem? Please describe.
When looking through notebooks, a bunch of them tend to be forks, which I am not really interested in viewing. For example, when I look at a notebook, all of the forks are consolidated in the main title. But, when looking at all notebooks in a workspace, the forks tend to take up most of the results, which makes it hard to see the current notebook state.

Describe the solution you'd like
When looking at the notebooks tab, allow for the ability to filter out forked notebooks. Currently there is an access dropdown, and it could be of a similar flavor.

Describe alternatives you've considered
Usually, rely on collections to see the current state of notebooks, since forks don't by default get added to notebooks. I also tend to update the title of forks with something like (v1.1) Notebook Title, then just don't merge in that cell when comparing forks or suggesting.