Remove check "unused secondary enum class constructor"

#KT-14040 Fixed

idea/src/org/jetbrains/kotlin/idea/inspections/UnusedSymbolInspection.kt

@@ -198,6 +198,7 @@ class UnusedSymbolInspection : AbstractKotlinInspection() {
             // Simple PSI-based checks
             if (declaration is KtObjectDeclaration && declaration.isCompanion()) return // never mark companion object as unused (there are too many reasons it can be needed for)
 
+            if (declaration is KtSecondaryConstructor && declaration.containingClass()?.isEnum() == true) return
             if (declaration.hasModifier(KtTokens.OVERRIDE_KEYWORD)) return
             if (declaration is KtProperty && declaration.isLocal) return
             if (declaration is KtParameter && (declaration.getParent().parent !is KtPrimaryConstructor || !declaration.hasValOrVar())) return

idea/testData/inspectionsLocal/unusedSymbol/enumSecondaryConstructor.kt

@@ -0,0 +1,12 @@
+// PROBLEM: none
+enum class MyEnum(val i: Int) {
+    HELLO(42),
+    WORLD("42")
+    ;
+
+    constructor<caret>(s: String): this(42)
+}
+
+fun test() {
+    MyEnum.HELLO
+}

idea/tests/org/jetbrains/kotlin/idea/inspections/LocalInspectionTestGenerated.java

@@ -8673,6 +8673,11 @@ public class LocalInspectionTestGenerated extends AbstractLocalInspectionTest {
             runTest("idea/testData/inspectionsLocal/unusedSymbol/dataInlineClassDeclaration.kt");
         }
 
+        @TestMetadata("enumSecondaryConstructor.kt")
+        public void testEnumSecondaryConstructor() throws Exception {
+            runTest("idea/testData/inspectionsLocal/unusedSymbol/enumSecondaryConstructor.kt");
+        }
+
         @TestMetadata("functionWithInlineClass.kt")
         public void testFunctionWithInlineClass() throws Exception {
             runTest("idea/testData/inspectionsLocal/unusedSymbol/functionWithInlineClass.kt");