DO NOT MERGE: Drop GkiInstallTest from TEST_MAPPING. The test no longer matters and we do not care about whether it regresses or not. Test: TH Bug: 259427298 Change-Id: I28d86b453633afd0c15e2cb1ce021c05fb0c49f9 (cherry picked from commit ece1d1dfd23111d99878349b216370852f6e98e4)