As a watchlist expiry user, I want the pop-up behavior to be updated, so that it properly displays within a reasonable amount of time.
**Background: **This is a follow-up to issues uncovered in T249262, which we would like to address separately.
**Acceptance Criteria:**
* When user first sees pop-up (i.e., upon first click of star), it should display for 6 seconds before being automatically dismissed
* When the user makes a temporary selection, the pop-up should display for 3 seconds before being automatically dismissed
* When the user clicks the star to unwatch the page, the pop-up should display for 3 seconds before being automatically dismissed
* If the user hovers the pop-up (for watching or unwatching the page), it should not be dismissed until they are no longer hovering over the pop-up (and the 3 or 6 seconds period should be reset)
* Note for testing: Can we see if people have time to select a temporary time period with keyboard shortcuts within 6 seconds?