GetElementsIT should fully test matchedVertex

[t92549]

#3131 adds testing of matchedVertex to Gaffer tests but does not fully add it for GetElementsIT:

Gaffer/integration-test/src/test/java/uk/gov/gchq/gaffer/integration/impl/GetElementsIT.java

Lines 655 to 661 in c67d5a3

	if (includeEdges && inOutType == IncludeIncomingOutgoingType.INCOMING) {
	ElementUtil.assertElementEquals(expectedElements, resultsSeed, true);
	ElementUtil.assertElementEquals(expectedElements, resultsElement, true);
	} else {
	ElementUtil.assertElementEqualsIncludingMatchedVertex(expectedElements, resultsSeed, true);
	ElementUtil.assertElementEqualsIncludingMatchedVertex(expectedElements, resultsElement, true);
	}

This is because the test never had the correct expected data as they never tested matchedVertex correctly. Therefore, the tests should be refactored and expect the correct data, and enable the matchedVertex check.