[PM] Add PackageInstaller CUJ test case (19/N)

Add CtsPackageInstallerCUJTestCases into postsubmit in TEST_MAPPING

Flag: TEST_ONLY
Bug: 332323403
Test: atest -p frameworks/base/core/java/android/content/pm/TEST_MAPPING:postsubmit
Test: atest -p frameworks/base/services/core/java/com/android/server/pm/TEST_MAPPING:postsubmit
Test: atest -p frameworks/base/packages/PackageInstaller/TEST_MAPPING:postsubmit
Change-Id: Ib40fa7d0c3e6fe9e1510adc161e4bdb77db6e923