Accessibility improvements for anchor tags in the admin page.

[Antoliny]

In a recent task where I added underlines to links in the main content area of the admin page(ticket34917), We added role="button" to elements where the underline shouldn't be visually displayed.
However, this approach is not ideal from an accessibility perspective.

When a screen reader accesses an element with role="button", it is read as a "button." However, since it is fundamentally an anchor tag, this may lead screen reader users to experience unexpected behavior.
Additionally, although it is announced as a "button," it does not support spacebar interaction because it remains as anchor tag at its core.

It seems we need to find an alternative way to remove the underline without adding role="button", while keeping the current underline styling intact elsewhere.

[Sarah Boyce]

We have ticket #36192 which is removing role="button"
Perhaps you can review the changes there