Remove long deactivated DnD tests from org.eclipse.ui.tests

The DnD tests in org.eclipse.ui.tests have been deactivated 12 years ago
and are incompatible since then. They particularly lack the ability to
hook into the drop process that was previously possible with some
functionality of the DragUtil class. In addition to these tests not
being used for 12 years, they now introduce maintenance issues:
- They use a JUnit-3-specific setup that is difficult to adapt to JUnit
4/5
- They are the sole remaining users of an AutoTest fragment including
specific test suite and logger implementations that are also still tied
to JUnit 3, as well as UITestCase specializations

Author: HeikoKlare

tests/org.eclipse.ui.tests/Eclipse UI Tests/org/eclipse/ui/tests/UiTestSuite.java

@@ -31,7 +31,6 @@
 import org.eclipse.ui.tests.decorators.DecoratorsTestSuite;
 import org.eclipse.ui.tests.dialogs.FilteredResourcesSelectionDialogTestSuite;
 import org.eclipse.ui.tests.dialogs.UIAutomatedSuite;
-import org.eclipse.ui.tests.dnd.DragTestSuite;
 import org.eclipse.ui.tests.dynamicplugins.DynamicPluginsTestSuite;
 import org.eclipse.ui.tests.encoding.EncodingTestSuite;
 import org.eclipse.ui.tests.fieldassist.FieldAssistTestSuite;
@@ -102,7 +101,6 @@
 	StyledStringHighlighterTest.class,
 	ZoomTestSuite.class,
 	DynamicPluginsTestSuite.class,
-	DragTestSuite.class,
 	IntroTestSuite.class,
 	MultiEditorTestSuite.class,
 	OpenSystemInPlaceEditorTest.class,