[APP-2532] Improve admin notice accessibility

[rami-elementor]

Related to #534

Add role="region" aria-label="Notice" to Ally notices.

✨ PR Description

Purpose: Enhance accessibility of admin notice components by adding ARIA attributes and semantic HTML roles for screen reader compatibility.

Main changes:

• Added role="region" and aria-label="Notice" attributes to admin notice div elements for proper ARIA landmark identification
• Added aria-hidden="true" to decorative notice icon wrapper to prevent screen readers from announcing non-essential visual elements
• Updated renewal notice sprintf template parameters to accommodate new accessibility attributes in rendered HTML output

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