Merge changes from topic "revert-10921255-revert-10403399-pkg-override-label-icon-DCRMJNYAKW-YCXMFEDIAG" into rvc-dev

* changes:
  Add mPackageParserCallback assignment in TestParams constructor
  Revert "Revert "Allow overriding the label and icon of a MainCom..."
  Revert^2 "Add test constructor to PackageManagerService"