Add CSuite target for 1p/3p apps pip flicker tests

Bug: 302034872
Test: csuite-tradefed run commandAndExit csuite-1p3p-pip-flickers --enable-module-dynamic-download --dynamic-download-args pstash:json-credentials-file=/google/data/ro/teams/app-compatibility/test-resources/config/google.com_mobileharness-0e27cf90c7cb.json --package WMShellFlickerTestsPipApps
Flag: NONE, new test configuration

Change-Id: Ia94f9733ef9d0126b83e6a003c8a9aa05bb08988