tests refactoring: extract loginAndGotoTab to an abstract class

...client/application/AuthorizationManagementConsolTest.java

...eric/client/web/client/application/DataSetSearchTest.java

...ent/application/EntityTypePropertyTypeAssignmentTest.java

.../client/web/client/application/ExperimentBrowserTest.java

...ic/client/web/client/application/MaterialBrowserTest.java

...lient/web/client/application/ProjectRegistrationTest.java

...client/application/PropertyTypeAssignmentBrowserTest.java

...lient/web/client/application/PropertyTypeBrowserTest.java

.../web/client/application/PropertyTypeRegistrationTest.java

...eric/client/web/client/application/SampleBrowserTest.java

...nt/web/client/application/VocabularyRegistrationTest.java

...web/client/application/ui/experiment/ListExperiments.java

...ent/web/client/application/ui/material/ListMaterials.java

.../client/web/client/application/ui/sample/ListSamples.java

.../client/web/client/application/ui/util/GridTestUtils.java

.../client/web/client/testframework/AbstractGWTTestCase.java

...n/experiment/GenericExperimentAttachmentDownloadTest.java

...ication/experiment/GenericExperimentRegistrationTest.java

...t/application/experiment/GenericExperimentViewerTest.java

...ent/application/sample/GenericSampleRegistrationTest.java