411664 implement includeSource attribute in target platform

* also added new test repository that contains bundles with sources
* add resolver tests for both planner and slicer mode

Bug: 411664
Change-Id: I3d33aedda1f207967a66d9c7b83e67394f72b8f9
Signed-off-by: Holger Oehm <holger.oehm@sap.com>