[PRTL-2025] add button role to attachment

[cofauver]

Jira: PRTL-2025

Overview:

In order to allow screen readers to indicate that the attachment is clickable, this PR adds a button role to the descriptor text. That text is the best place for the button role because it allows the screen reader to announce the effect that clicking will have.

Screenshots/GIFs:

Before

attachment_before.mov

After

attachment_after.mov

Testing:

• Unit tests
• Manual tests:
  • Chrome
  • Safari
  • IE11

Roll Out:

• Before merging:
  • Updated docs
  • Bumped version in package.json
    • Breaking change?
      • If it is a beta component run npm version minor
      • If the component is not in beta run npm version major
    • New component or backward-compatible component feature change? Run npm version minor
    • Only changing documentation? All good. Skip this step.
  • After creating a new component, make sure to add it to the Components List in ComponentsView.jsx. To do so:
    • Add a screenshot of the component in docs/assets/img with the format <COMPONENT URL LINK>.png
• After merging:
  • Deployed updated docs (make deploy-docs)
  • Posted in #eng if I made a breaking change to a beta component

[Maddiebusta]

gotta love a button role!