[FIR] Prohibit expect class members with default values actualized

...by fake-override.
It is error without deprecation cycle because `expect` and `actual`
classes are still in Beta and expected impact of change is negligible.

^KT-62036 Fixed

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDataClassConverters.kt

@@ -3628,6 +3628,16 @@ internal val KT_DIAGNOSTIC_CONVERTER = KtDiagnosticConverterBuilder.buildConvert
             token,
         )
     }
+    add(FirErrors.DEFAULT_ARGUMENTS_IN_EXPECT_ACTUALIZED_BY_FAKE_OVERRIDE) { firDiagnostic ->
+        DefaultArgumentsInExpectActualizedByFakeOverrideImpl(
+            firSymbolBuilder.classifierBuilder.buildClassLikeSymbol(firDiagnostic.a),
+            firDiagnostic.b.map { firNamedFunctionSymbol ->
+                firSymbolBuilder.functionLikeBuilder.buildFunctionSymbol(firNamedFunctionSymbol)
+            },
+            firDiagnostic as KtPsiDiagnostic,
+            token,
+        )
+    }
     add(FirErrors.EXPECTED_FUNCTION_SOURCE_WITH_DEFAULT_ARGUMENTS_NOT_FOUND) { firDiagnostic ->
         ExpectedFunctionSourceWithDefaultArgumentsNotFoundImpl(
             firDiagnostic as KtPsiDiagnostic,

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnostics.kt

@@ -2548,6 +2548,12 @@ sealed interface KtFirDiagnostic<PSI : PsiElement> : KtDiagnosticWithPsi<PSI> {
         val members: List<KtCallableSymbol>
     }
 
+    interface DefaultArgumentsInExpectActualizedByFakeOverride : KtFirDiagnostic<KtClass> {
+        override val diagnosticClass get() = DefaultArgumentsInExpectActualizedByFakeOverride::class
+        val expectClassSymbol: KtClassLikeSymbol
+        val members: List<KtFunctionLikeSymbol>
+    }
+
     interface ExpectedFunctionSourceWithDefaultArgumentsNotFound : KtFirDiagnostic<PsiElement> {
         override val diagnosticClass get() = ExpectedFunctionSourceWithDefaultArgumentsNotFound::class
     }

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnosticsImpl.kt

@@ -3069,6 +3069,13 @@ internal class DefaultArgumentsInExpectWithActualTypealiasImpl(
     token: KtLifetimeToken,
 ) : KtAbstractFirDiagnostic<KtTypeAlias>(firDiagnostic, token), KtFirDiagnostic.DefaultArgumentsInExpectWithActualTypealias
 
+internal class DefaultArgumentsInExpectActualizedByFakeOverrideImpl(
+    override val expectClassSymbol: KtClassLikeSymbol,
+    override val members: List<KtFunctionLikeSymbol>,
+    firDiagnostic: KtPsiDiagnostic,
+    token: KtLifetimeToken,
+) : KtAbstractFirDiagnostic<KtClass>(firDiagnostic, token), KtFirDiagnostic.DefaultArgumentsInExpectActualizedByFakeOverride
+
 internal class ExpectedFunctionSourceWithDefaultArgumentsNotFoundImpl(
     firDiagnostic: KtPsiDiagnostic,
     token: KtLifetimeToken,