Global - Markup for banners has incorrect ARIA

[laflannery]

Description

The markup for the banners used within next-build have incorrect ARIA (role and aria-label) that need to be removed

1. Both the facilities banners and the Sitewide banners are using the <va-banner> component however they also both have a role attribute that should not be present. The role is inside the element, within the shadow DOM and should not be duplicated here.

- The `role` needs to be removed from [the facilities banner file](https://github.com/department-of-veterans-affairs/next-build/blob/main/src/templates/common/banners/facilityBanner/index.tsx)
- The `role` needs to be removed from [the sitewide banner file](https://github.com/department-of-veterans-affairs/next-build/blob/main/src/templates/common/banners/banner/index.tsx)

2. The <div> for the maintenance banner has an incorrect role and aria-label that both need to be removed from this file
   

3. The promo banner also has an incorrect role that needs to be removed from this file

Acceptance Criteria

• Remove role="region" from all banners markup in next-build
• Remove aria-label attribute from Maintenance Banner div in next-build
• Accessibility review from @laflannery

[laflannery]

@jilladams and @FranECross and @gracekretschmer-metrostar, This is a ticket regarding next-build templates. I'm not sure that this should be looked at/worked on by Sitewide at this time. I think it's a question of CMS still needing to determine a process and ownership of the migration work before this moves forward. Let me know if I'm incorrect obviously CC: @Shamiaalam

[jilladams]

That's where we landed during refinement as well. For now we said: we'll leave it where it is until the AP team is spun up and we can figure out where / how Sitewide can best support.