Add GRPCVehicleProxyServerUnitTest to auto-presubmit.

Test: Presubmit
Bug: 393154530
Flag: EXEMPT test
Change-Id: I8ea9aeab1ca4c834bb3ff524b238a6f72ba819a3
diff --git a/automotive/vehicle/TEST_MAPPING b/automotive/vehicle/TEST_MAPPING
index de59fdc..cdc6e56 100644
--- a/automotive/vehicle/TEST_MAPPING
+++ b/automotive/vehicle/TEST_MAPPING
@@ -48,6 +48,9 @@
       "name": "GRPCVehicleHardwareUnitTest"
     },
     {
+      "name": "GRPCVehicleProxyServerUnitTest"
+    },
+    {
       "name": "CarServiceHalUnitTest"
     },
     {