fix(EditRoomInfo): align system-messages MultiSelect with new fuselage a11y

The MultiSelect anchor in @rocket.chat/fuselage now exposes role="combobox"
and uses aria-label/aria-labelledby for its accessible name (the placeholder
is rendered as inert children). The recently added EditRoomInfo.spec.tsx was
written against the previous fuselage where the anchor was a plain button
named by its placeholder, so getByRole('button', { name: /Select messages
to hide/i }) no longer matches and CI's Unit Tests fail on develop.

- Pass aria-label to the MultiSelect so the combobox has an accessible name.
- Update the spec helper to query by the combobox role.

Author: ggazzo

.changeset/edit-room-info-multiselect-aria-label.md

@@ -0,0 +1,5 @@
+---
+'@rocket.chat/meteor': patch
+---
+
+Adds an accessible label to the system-messages multi-select in the channel edit panel so screen readers announce its purpose.

apps/meteor/client/views/room/contextualBar/Info/EditRoomInfo/EditRoomInfo.spec.tsx

@@ -64,7 +64,7 @@ const removeSystemMessageChip = async (translationKey: string) => {
 };
 
 const selectSystemMessageOption = async (translationKey: string) => {
-	const trigger = screen.getByRole('button', { name: /Select messages to hide/i });
+	const trigger = screen.getByRole('combobox', { name: /Select messages to hide/i });
 	await userEvent.click(trigger);
 
 	const listboxes = await screen.findAllByRole('listbox', { hidden: true });

apps/meteor/client/views/room/contextualBar/Info/EditRoomInfo/EditRoomInfo.tsx

@@ -483,6 +483,7 @@ const EditRoomInfo = ({ room, onClickClose, onClickBack }: EditRoomInfoProps) =>
 																options={sysMesOptions}
 																disabled={!hideSysMes || isFederated}
 																placeholder={t('Select_messages_to_hide')}
+																aria-label={t('Select_messages_to_hide')}
 															/>
 														)}
 													/>