feat(applets): add destroy tooltip popup action

[hammerlink]

Problem

When an applet is minimized, its tooltip remains visible after activating the minimized button.
After the applet button is clicked it gets removed and it is no longer capable of detecting mouse movements.

Solution

After the applet button is removed destroy the tooltip popup.

At the moment the cosmic-applet-minimize cannot access the WindowId of the popup.
Therefor this PR exposes a Surface Action to destroy the tooltip popup on Window TOOLTIP_WINDOW_ID.
An alternative can be to expose TOOLTIP_WINDOW_ID directly instead of adding a new Surface action. Will change if wanted.

Related to pop-os/cosmic-panel#458
Needed for pop-os/cosmic-applets#1324

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[wash2]

this should be gated by the applet feature

Suggested change

	iced_winit::commands::popup::destroy_popup(*crate::applet::TOOLTIP_WINDOW_ID)
	#[cfg(feature = "applet")]
	{
	iced_winit::commands::popup::destroy_popup(*crate::applet::TOOLTIP_WINDOW_ID)
	}
	#[cfg(not(feature = "applet"))]
	{
	Task::none()
	}

[hammerlink]

Fair point, tested and applied it (had to apply the commit on libcosmic rev 384e8f6 to match the applet-minimize repo).

Though I think it would not cause any harm because of how the Destroy is handled. It is better to not run this task at all otherwise.