[EuiSuperDatePicker] Update button tooltip occurs too often

[cchaos]

The "Click to apply" tooltip shows up everytime the input changes its date. That means it occurs even before the user is done navigating through the popover options.

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This is extremely annoying and overly aggressive. Instead, since no editing can happen outside of the popover, the EuiSuperDatePicker should watch for the popover close event and then show the tooltip.