Add triggering pollPendingSatelliteDatagrams after successfully sending a...

Add triggering pollPendingSatelliteDatagrams after successfully sending a callback back to sendSatelliteDatagram.

Bug: 329033411
Test: manual - test satellite demo mode on the device
Test: atest SatelliteManagerTestOnMockService
Test: atest DatagramDispatcherTest
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:fb9fa4b8804f853243258773b36c15b1a49978c7)
Merged-In: Ia16b66ba811cd2d2f0c030ac8020475e2533c155
Change-Id: Ia16b66ba811cd2d2f0c030ac8020475e2533c155