feat(ui5-button, ui5-link): support accessibile description

[didip1000]

Background

This change introduces the property accessibleDescription property to the ui5-lnk and ui5-button components. This new property enables developers to provide an accessible description, which sets the aria-description attribute for the component.

Usage:

To provide an accessible description for a Link or Button, you can use the accessibleDescription property as follows:

<ui5-link accessible-description="This is a link with a description"></ui5-link>

<ui5-Button accessible-description="This is a button with a description"></ui5-Button>

Related Issues:

• ui5-button: ui5-button: add API for adding aria-describedby to inner button element #5310
• ui5-link: ui5-link: Cannot set aria-describedby attribute #3993

[unazko]

The accessibility announcements with NVDA, JAWS and voiceOver work as expected.