Include a view for "Your activity" from the Activity dashboard page

Problem to solve

Today, the default tab for the Activity dashboard is "Your projects". Although this is useful, users may actually find more value in having the default view as "Your activity" (specific to the user). To find this activity today, they have to navigate to their profile page and then to the Activity tab.

Proposal

Introduce a new Tab on the Activity dashboard for "Yours" (similar to what we do on the Projects dashboard), and have this as the first/default Tab.

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