[FIR] Use isSubtypeOfClass with platform types mapping instead of isSubtypeOf during checking CAST_NEVER_SUCCEEDS

Refactor and generalize code

^KT-62783 Fixed

compiler/fir/analysis-tests/testData/resolve/checkers/unsuccessfullCastToStartProjectedType.kt

@@ -5,5 +5,5 @@ class Foo1<A> : Foo<Int>()
 class Foo2 : Foo<Int>()
 
 fun process(foo: Foo<Long>) {
-    foo <!CAST_NEVER_SUCCEEDS!>as<!> Foo1<*>
+    foo as Foo1<*>
 }

compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirLightTreeOldFrontendDiagnosticsTestGenerated.java

@@ -5784,6 +5784,12 @@ public class FirLightTreeOldFrontendDiagnosticsTestGenerated extends AbstractFir
                 public void testNoGenericsUnrelated() throws Exception {
                     runTest("compiler/testData/diagnostics/tests/cast/neverSucceeds/NoGenericsUnrelated.kt");
                 }
+
+                @Test
+                @TestMetadata("NullableExprToItsNonNullableGenericBaseClass.kt")
+                public void testNullableExprToItsNonNullableGenericBaseClass() throws Exception {
+                    runTest("compiler/testData/diagnostics/tests/cast/neverSucceeds/NullableExprToItsNonNullableGenericBaseClass.kt");
+                }
             }
         }
 

compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirPsiOldFrontendDiagnosticsTestGenerated.java

@@ -5790,6 +5790,12 @@ public class FirPsiOldFrontendDiagnosticsTestGenerated extends AbstractFirPsiDia
                 public void testNoGenericsUnrelated() throws Exception {
                     runTest("compiler/testData/diagnostics/tests/cast/neverSucceeds/NoGenericsUnrelated.kt");
                 }
+
+                @Test
+                @TestMetadata("NullableExprToItsNonNullableGenericBaseClass.kt")
+                public void testNullableExprToItsNonNullableGenericBaseClass() throws Exception {
+                    runTest("compiler/testData/diagnostics/tests/cast/neverSucceeds/NullableExprToItsNonNullableGenericBaseClass.kt");
+                }
             }
         }