Feature: Save tracked repo filter settings in the querystring

[nickytonline]

As a user of workspaces, I want the tracked repositories filter to persist between pages so that I do not have to reselect them every time.

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[nickytonline]

This should be persisted in the querystring instead of component state. For example here are the issues and PR grids in a workspaces activity section.

Notice that when you change grids, the tracked repository filtering is reset.