E2E framework: avoid duplicate FeatureGate tags

75448c416b added feature gate dependencies at the end of a test
name. However, if those tags were already part of the previous text, either
because they were explicitly added in the current node or in some parent node,
then redundant tags were added.

Now this special case is detected and such redundant tags do not get added
again.

test/e2e/framework/ginkgowrapper.go

@@ -293,13 +293,16 @@ func expandGinkgoArgs(leafNode bool, offset ginkgo.Offset, text string, args []a
 	if text != "" {
 		texts = append(texts, text)
 	}
+	previousText := ""
 
 	// All labels for a leaf node, from parent and added in this call.
 	allLabels := sets.New[string]()
 	if leafNode {
 		// May only be called during tree construction, i.e. not for the top-level node,
 		// so we have to be a bit careful.
-		allLabels = sets.New[string](ginkgo.CurrentTreeConstructionNodeReport().Labels()...)
+		report := ginkgo.CurrentTreeConstructionNodeReport()
+		previousText = report.FullText()
+		allLabels = sets.New[string](report.Labels()...)
 	}
 	addLabel := func(label string) {
 		ginkgoArgs = append(ginkgoArgs, ginkgo.Label(label))
@@ -404,7 +407,15 @@ func expandGinkgoArgs(leafNode bool, offset ginkgo.Offset, text string, args []a
 
 		slices.Sort(delayedLabels)
 		for _, label := range delayedLabels {
-			texts = append(texts, fmt.Sprintf("[%s]", label))
+			text := fmt.Sprintf("[%s]", label)
+			if strings.Contains(previousText, text) ||
+				slices.Contains(texts, text) {
+				// Never repeat text at the end which was already included earlier.
+				// In practice, this can happen for a FeatureGate when it was both
+				// explicitly mentioned and a dependency.
+				continue
+			}
+			texts = append(texts, text)
 			// This keeps validateText happy.
 			ginkgoArgs = append(ginkgoArgs, ginkgo.Label(label))
 		}