Speed up TzS2PolygonsToTzS2CellUnionsTest am: cac51dcbbf am: 042cc25f20 am: 42f0276e0c am: 5afe5927a0

Original change: https://android-review.googlesource.com/c/platform/packages/modules/GeoTZ/+/2068288

Change-Id: Iac86a2ed82e9b63217768a1109e512e791db6d41
Signed-off-by: Automerger Merge Worker <[email protected]>