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]

Ahh this has conflicts now, could you rebase and update the feature gate? I'll re-approve and merge after that.