[K2]: Support java-kotlin interop for @SubclassOptInRequired

Previously, if the parent class was in Java code and the subclass in
Kotlin, the opt-in usage error would not be reported for the subclass.
The problem was that the extractClassFromArgument function couldn't get
the class type from Java code. It was looking for a ConeClassLikeType,
but found a ConeFlexibleType instead.

#KT-60258 Fixed

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosticCompilerTestFE10TestdataTestGenerated.java

@@ -42259,6 +42259,12 @@ public class DiagnosticCompilerTestFE10TestdataTestGenerated extends AbstractDia
                     runTest("compiler/testData/diagnostics/testsWithStdLib/annotations/subclassOptInRequired/InnerClasses.kt");
                 }
 
+                @Test
+                @TestMetadata("JavaKotlinInterop.kt")
+                public void testJavaKotlinInterop() throws Exception {
+                    runTest("compiler/testData/diagnostics/testsWithStdLib/annotations/subclassOptInRequired/JavaKotlinInterop.kt");
+                }
+
                 @Test
                 @TestMetadata("NestedClasses.kt")
                 public void testNestedClasses() throws Exception {

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/LLFirPreresolvedReversedDiagnosticCompilerFE10TestDataTestGenerated.java

@@ -42259,6 +42259,12 @@ public class LLFirPreresolvedReversedDiagnosticCompilerFE10TestDataTestGenerated
                     runTest("compiler/testData/diagnostics/testsWithStdLib/annotations/subclassOptInRequired/InnerClasses.kt");
                 }
 
+                @Test
+                @TestMetadata("JavaKotlinInterop.kt")
+                public void testJavaKotlinInterop() throws Exception {
+                    runTest("compiler/testData/diagnostics/testsWithStdLib/annotations/subclassOptInRequired/JavaKotlinInterop.kt");
+                }
+
                 @Test
                 @TestMetadata("NestedClasses.kt")
                 public void testNestedClasses() throws Exception {