Use OverlayMenu for TopBar

[atjn]

The top bar has previously used its own custom overlay menu, but all other components in the UI use the standardized OverlayMenu. This makes the top bar use the same overlay menu.

The checkboxes have never worked properly and are not connected to any logic. I have disabled some of the offending code by commenting it out. We can fix this later when we know how they will be used.

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[atjn]

A lot of tests are failing, it might not be possible to fix this before code freeze. That is okay, we can leave this PR ready for the next group to merge.

The tests are probably related to the popover menu, so they might just magically start to pass in a few months when all playwright browsers start supporting the popover element.

[KamyaPA]

A lot of tests are failing, it might not be possible to fix this before code freeze. That is okay, we can leave this PR ready for the next group to merge.

The tests are probably related to the popover menu, so they might just magically start to pass in a few months when all playwright browsers start supporting the popover element.

I have requested a review from he who wrote the topbar to begin with. I don't feel like I can approve these changes without his consent.