Reenable tests ignored due to signer information issue

After upgrade to latest Target Platform, 2 tests were failing (and currently maked as ignore to be able to release):

• GoToMarkerForCamelEditorTest
•  ExecutePomActionSupportTest

both with:

class "org.eclipse.ui.IFileEditorInput"'s signer information does not match signer information of other classes in the same package{quote}

Functionalities of what is tested are working fine. Our first investigations led to think that it is a problem between Mockito and IFileEditorInput which is an Eclipse class. High chance it is affecting only tests.