[kotlin] Run import optimizer when no usages are found

Fixes the issue in Kotlin, Java and Groovy. #KTIJ-28288 Fixed

GitOrigin-RevId: 7cd5942539a10f9ccdba386396f15546b0a9ac00

java/java-tests/testData/refactoring/moveClass/withoutReference/after/pack2/X.java

@@ -0,0 +1,7 @@
+package pack2;
+
+public class X {
+  public static void main(String[] args) {
+    Y().foo();
+  }
+}

java/java-tests/testData/refactoring/moveClass/withoutReference/after/pack2/Y.java

@@ -0,0 +1,5 @@
+package pack2;
+
+public class Y {
+  void foo() { }
+}

java/java-tests/testData/refactoring/moveClass/withoutReference/before/pack1/X.java

@@ -0,0 +1,9 @@
+package pack1;
+
+import pack2.Y;
+
+public class X {
+  public static void main(String[] args) {
+    Y().foo();
+  }
+}

java/java-tests/testData/refactoring/moveClass/withoutReference/before/pack2/Y.java

@@ -0,0 +1,5 @@
+package pack2;
+
+public class Y {
+  void foo() { }
+}