Bug 1168229 - Overview tab missing for External imports editor

(cherry picked from commit d2d6be0b856aad992e0f04e9507533f16ec62d69)

Conflicts:
	kie-wb-common-screens/kie-wb-common-project-imports-editor/kie-wb-common-project-imports-editor-client/src/main/java/org/kie/workbench/common/screens/projectimportsscreen/client/forms/ProjectImportsScreenPresenter.java
	kie-wb-common-screens/kie-wb-common-project-imports-editor/kie-wb-common-project-imports-editor-client/src/main/java/org/kie/workbench/common/screens/projectimportsscreen/client/forms/ProjectImportsScreenView.java
	kie-wb-common-screens/kie-wb-common-project-imports-editor/kie-wb-common-project-imports-editor-client/src/main/java/org/kie/workbench/common/screens/projectimportsscreen/client/forms/ProjectImportsScreenViewImpl.java
Bug 1168229 - Overview tab missing for External imports editor