fix(Select): set isScrollable internally (#10320)

Author: adamviktora

packages/react-core/src/components/Select/Select.tsx

@@ -163,7 +163,7 @@ const SelectBase: React.FunctionComponent<SelectProps & OUIAProps> = ({
       }}
       isPlain={isPlain}
       selected={selected}
-      isScrollable={isScrollable}
+      isScrollable={isScrollable ?? (menuHeight !== undefined || maxMenuHeight !== undefined)}
       {...getOUIAProps(
         Select.displayName,
         props.ouiaId !== undefined ? props.ouiaId : getDefaultOUIAId(Select.displayName),