[JS IR] Disable some flaky stepping tests

^KT-54283

compiler/testData/debug/stepping/tryCatchExpression.kt

@@ -1,5 +1,5 @@
 // FILE: test.kt
-
+// DONT_TARGET_EXACT_BACKEND: JS_IR (KT-54283)
 fun foo() {
     try {
         mightThrow()

compiler/testData/debug/stepping/tryCatchFinally.kt

@@ -1,4 +1,4 @@
-
+// DONT_TARGET_EXACT_BACKEND: JS_IR (KT-54283)
 // FILE: test.kt
 
 fun foo() {

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/IrJsSteppingTestGenerated.java

@@ -493,18 +493,6 @@ public class IrJsSteppingTestGenerated extends AbstractIrJsSteppingTest {
         runTest("compiler/testData/debug/stepping/tryCatch.kt");
     }
 
-    @Test
-    @TestMetadata("tryCatchExpression.kt")
-    public void testTryCatchExpression() throws Exception {
-        runTest("compiler/testData/debug/stepping/tryCatchExpression.kt");
-    }
-
-    @Test
-    @TestMetadata("tryCatchFinally.kt")
-    public void testTryCatchFinally() throws Exception {
-        runTest("compiler/testData/debug/stepping/tryCatchFinally.kt");
-    }
-
     @Test
     @TestMetadata("tryFinally.kt")
     public void testTryFinally() throws Exception {