Quick scroll to milestone changed system note

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• Click an icon or some affordance near the milestone area in the sidebar, and the screen quickly scrolls to the system note telling you when the milestone was last changed.
• Maybe also highlight the system note row with a background color?
• In the example mockup, the icon is a calendar icon. We can do better.
• If the milestone was changed multiple times (including removed), it scrolls to the latest change.
• If the milestone was never changed (either empty milestone or non-empty milestone upon issue creation), it scrolls to the header of the issue (showing the timestamp there).
• In the future, we can use a similar design for assignees, weights, labels, and other sidebar elements.