Polishing haptics for magnetic swipes.

We should flag the usage of MSDL haptics in the threshold moments. In
addition, we have refined the pulling texture by appling an exponential
scaling and controlling the number of vibration calls with a temporal
threshold. The overall texture is now more subtle.

Test: manual. Verified the new texture plays when dragging a
  notification below the detach threshold.
Test: manual. Verified threshold haptics play correctly.
Bug: 399633875
Flag: com.android.systemui.magnetic_notification_swipes
Change-Id: Ib40742381f201602985be5bf3db51b3e4127a480