JVM IR: script is a valid container for local delegated properties

When serializing metadata for local delegated properties, we need to
find a valid container class where to put it, and where kotlin-reflect
will be able to find that metadata at runtime. Taking just the closest
class lexically doesn't work, because in the attached test, it is a
class for a lambda which does not have metadata and thus does not have a
way to store any extra information.

So, in 1663619606 we started to look for the closest "non-synthetic"
class to store this metadata. But apparently it was missed that script
is a valid container class. In the test, this meant that no
non-synthetic container classes were found to store the metadata, so we
falled back to using the closest class anyway (see `?: this` in
`rememberLocalProperty`), which turned out to be the lambda.

After this change, metadata for local delegated property in a lambda
will be stored in the script class, just like it's stored in the file
class in the non-script case.

 #KT-55065 Fixed

compiler/tests-gen/org/jetbrains/kotlin/codegen/ScriptCodegenTestGenerated.java

@@ -90,6 +90,11 @@ public class ScriptCodegenTestGenerated extends AbstractScriptCodegenTest {
         runTest("compiler/testData/codegen/script/localDelegatedProperty.kts");
     }
 
+    @TestMetadata("localDelegatedPropertyInLambda.kts")
+    public void testLocalDelegatedPropertyInLambda() throws Exception {
+        runTest("compiler/testData/codegen/script/localDelegatedPropertyInLambda.kts");
+    }
+
     @TestMetadata("localDelegatedPropertyNoExplicitType.kts")
     public void testLocalDelegatedPropertyNoExplicitType() throws Exception {
         runTest("compiler/testData/codegen/script/localDelegatedPropertyNoExplicitType.kts");