Update to check package name for multi-instnaces split

Update to check package name to determine whether it is launching the
same app adjacently or not instead of checking component name. This is
to cover more cases when the running task was started from a different
component with its app icon.

Bug: 255224696
Test: atest WMShellUnitTests
Test: check with the repro steps in bug.
Change-Id: I135d6cf518cda603484824dfae61290672f443c7