name suggestions: skip pluralization when component type is the same as original (IDEA-89143)

java/java-tests/testData/refactoring/introduceVariable/NameSuggestion.after.java

@@ -0,0 +1,9 @@
+abstract class Path implements Iterable<Path>{}
+class Paths {
+  public static Path get(String s) {return null;}
+}
+class Usage {
+  public static void main(String[] args) {
+      Path path = Paths.get("");
+  }
+}

java/java-tests/testData/refactoring/introduceVariable/NameSuggestion.java

@@ -0,0 +1,9 @@
+abstract class Path implements Iterable<Path>{}
+class Paths {
+  public static Path get(String s) {return null;}
+}
+class Usage {
+  public static void main(String[] args) {
+    <selection>Paths.get("")</selection>
+  }
+}