Postfix templates: remove entire expression statement for topLevelExpression-like templates only (IDEA-188667)

java/java-tests/testData/codeInsight/template/postfix/templates/arg/inStatement.java

@@ -0,0 +1,5 @@
+public class Foo {
+  void m(boolean b) {
+    "".arg<caret>;
+  }
+}

java/java-tests/testData/codeInsight/template/postfix/templates/arg/inStatement_after.java

@@ -0,0 +1,5 @@
+public class Foo {
+  void m(boolean b) {
+      functionCall(""<caret>);
+  }
+}