Delay abstract class member forbiddance (see KT-45508) to 1.7

compiler/testData/diagnostics/tests/java8Overrides/kt45508.kt

@@ -1,4 +1,5 @@
 // FIR_IDENTICAL
+// !LANGUAGE: +AbstractClassMemberNotImplementedWithIntermediateAbstractClass
 interface A {
     fun foo(): Any
 }

compiler/util/src/org/jetbrains/kotlin/config/LanguageVersionSettings.kt

@@ -201,7 +201,6 @@ enum class LanguageFeature(
     ForbidUsingExtensionPropertyTypeParameterInDelegate(KOTLIN_1_6, kind = BUG_FIX),
     ProhibitSelfCallsInNestedObjects(KOTLIN_1_6, kind = BUG_FIX),
     ProperCheckAnnotationsTargetInTypeUsePositions(KOTLIN_1_6, kind = BUG_FIX),
-    AbstractClassMemberNotImplementedWithIntermediateAbstractClass(KOTLIN_1_6, kind = BUG_FIX),
 
     SuspendFunctionAsSupertype(KOTLIN_1_6),
     UnrestrictedBuilderInference(KOTLIN_1_6),
@@ -230,6 +229,7 @@ enum class LanguageFeature(
     SafeCallsAreAlwaysNullable(KOTLIN_1_7),
     ApproximateIntegerLiteralTypesInReceiverPosition(KOTLIN_1_7),
     StopPropagatingDeprecationThroughOverrides(KOTLIN_1_7),
+    AbstractClassMemberNotImplementedWithIntermediateAbstractClass(KOTLIN_1_7, kind = BUG_FIX),
 
     // Temporarily disabled, see KT-27084/KT-22379
     SoundSmartcastFromLoopConditionForLoopAssignedVariables(sinceVersion = null, kind = BUG_FIX),