Report mock measurements consistent with SvInfo

This CL updates the cuttlefish (emulator) implementation only.

Previously it only reports one GnssMeasurement but there are many more GnssStatus which are used-in-fix. It causes a CTS test failure which checks the consistency between GnssMeasurement and GnssStatus.

Bug: 401427992
Test: atest GnssMeasurementValuesTest#testListenForGnssMeasurements
Flag: TEST_ONLY
Change-Id: I255b88c583e21b3ca9b525853433800f1b4dc1e3