Invalidate tooltips when mouse leaves element's hitbox (cherry-pick #22488)

[gcp-cherry-pick-bot]

Cherry-picked Invalidate tooltips when mouse leaves element's hitbox (#22488)

Closes #21657

In case of the task rerun button tooltip from

zed/crates/terminal_view/src/terminal_view.rs

Lines 1051 to 1070 in f6dabad

	.group("term-tab-icon")
	.child(
	h_flex()
	.group("term-tab-icon")
	.child(
	div()
	.when(rerun_button.is_some(), |this| {
	this.hover(|style| style.invisible().w_0())
	})
	.child(Icon::new(icon).color(icon_color)),
	)
	.when_some(rerun_button, |this, rerun_button| {
	this.child(
	div()
	.absolute()
	.visible_on_hover("term-tab-icon")
	.child(rerun_button),
	)
	}),
	)

, the actual button element is not styled as invisible, only its parent.
Zed won't render such element since it's parent is hidden, but will
consider it "visible" all the time its paint is called, spawning a
task with the delay, that will create the tooltip:

zed/crates/gpui/src/elements/div.rs

Lines 1949 to 1959 in f6dabad

	cx.background_executor().timer(TOOLTIP_DELAY).await;
	cx.update(|cx| {
	active_tooltip.borrow_mut().replace(ActiveTooltip {
	tooltip: Some(AnyTooltip {
	view: build_tooltip(cx),
	mouse_position: cx.mouse_position(),
	}),
	_task: None,
	});
	cx.refresh();
	})

When the parent is hidden, the child won't be painted anymore, and no
mouse listeners will be able to detect this fact and hide the tooltip.

Hence, check such cases separately, during prepaint, and invalidate
the tooltips that are not valid anymore.
We cannot use hitbox.is_hovered(cx) as it's not really hovered during
prepaint, so a mouse position check is used instead.

Release Notes:

• Fixed tooltips getting stuck