Add haptics for opening taskbar pinning popup view from anywhere

The divider's listener is implemented via `View.OnLongClickListener`,
which automatically handles haptics. While the taskbar view uses a
custom gesture detector (to get the associated event and its x/y
coordinates), which doesn't have the same logic out of the box. This CL
adds a manual call to perform haptic feedback for long press events
(this also corresponds to the implementation in a similar gesture
detector - `WorkspaceTouchListener`).

Bug: 382056013
Flag: com.android.launcher3.show_taskbar_pinning_popup_from_anywhere
Test: manual on a fold
Change-Id: I3887e0f9839a7992ccd8b6786bdf1268bfafd09e