fix(ui): attach aria-label and aria-labelledby props to Select component

The Select component was accepting aria-label and aria-labelledby props
but not forwarding them to the underlying AriaSelect element, making
them ineffective for accessibility. This fix ensures these props are
properly attached to the rendered element.

🤖 Generated with [Claude Code](https://claude.ai/code)

Signed-off-by: MT Lewis <mtlewis@users.noreply.github.com>
Co-Authored-By: Claude <noreply@anthropic.com>

.changeset/fix-select-aria-props.md

@@ -0,0 +1,5 @@
+---
+'@backstage/ui': patch
+---
+
+Fix Select component to properly attach aria-label and aria-labelledby props to the rendered element for improved accessibility.

packages/ui/src/components/Select/Select.tsx

@@ -70,6 +70,8 @@ export const Select = forwardRef<HTMLDivElement, SelectProps>((props, ref) => {
       className={clsx(classNames.root, className)}
       {...dataAttributes}
       ref={ref}
+      aria-label={ariaLabel}
+      aria-labelledby={ariaLabelledBy}
       {...rest}
     >
       <FieldLabel