fix(ui5-avatar-group): remove role=button when no overflow and no hasPopup

[NakataCode]

Bug Fix: Conditional ARIA Attributes for Avatar Group

Problem

type="Group" unconditionally exposed:

• role="button"
• tabindex="0"
• The "Activate for complete list." aria-label suffix

...even when all avatars fit the container and there was nothing to reveal. Pressing
Enter/Space fired ui5-click with no visible effect, violating
WCAG 2.2 SC 4.1.2 (Name, Role, Value).

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Solution

Introduce a _isInteractiveGroup getter that returns true only when:

• The group has overflow (_hiddenItems > 0), or
• accessibilityAttributes.hasPopup is set

Gate the following on this getter:

Property	Behavior
_role	Only set to button when interactive
_ariaLabelText suffix	Only appended when interactive
_containerAriaHasPopup	Only set when interactive
Event firing	Only fires ui5-click when interactive

Note: The group retains tabindex="0" in all cases so it remains keyboard-discoverable.

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Fixes: #13677

[sap-ui5-webcomponents-release]

🚀 Deployed on https://pr-13709--ui5-webcomponents-preview.netlify.app