KT-11765 Analyze code in anonymous initializer of inteface

#KT-11765 Fixed

idea/testData/checker/regression/InitializerInInterface.kt

@@ -0,0 +1,6 @@
+interface I {
+    <error>init {
+        val c = 1
+        val g = c
+    }</error>
+}

idea/tests/org/jetbrains/kotlin/checkers/PsiCheckerTestGenerated.java

@@ -526,6 +526,12 @@ public class PsiCheckerTestGenerated extends AbstractPsiCheckerTest {
             doTest(fileName);
         }
 
+        @TestMetadata("InitializerInInterface.kt")
+        public void testInitializerInInterface() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/checker/regression/InitializerInInterface.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("InterfaceDeclarationAsExpression.kt")
         public void testInterfaceDeclarationAsExpression() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/checker/regression/InterfaceDeclarationAsExpression.kt");