FIR JS: temporarily mute remaining codegen tests

compiler/testData/codegen/box/enum/defaultCtor/noPrimaryConstructor.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_K2: JS_IR
 
 enum class Test {
     A(0),

compiler/testData/codegen/box/enum/defaultCtor/secondaryConstructorWithDefaultArguments.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_K2: JS_IR
 enum class Test(val x: Int, val str: String) {
     OK;
     constructor(x: Int = 0) : this(x, "OK")

compiler/testData/codegen/box/enum/defaultCtor/secondaryConstructorWithVararg.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_K2: JS_IR
 enum class Test(val x: Int, val str: String) {
     OK;
     constructor(vararg xs: Int) : this(xs.size + 42, "OK")

compiler/testData/codegen/box/enum/emptyConstructor.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_K2: JS_IR
 package test
 
 enum class My(val s: String) {