chore: use none ARIA role consistently instead of presentation

[dejoski]

Summary

• add aria.Role.NONE for the ARIA none role
• replace internal uses of the presentation role with the none role
• update role assertions in the affected mocha tests

Closes #9993

Validation

• npm ci
• npm run lint --workspace blockly
• npm run tsc --workspace blockly
• git diff --check

[github-actions]

Welcome! It looks like this is your first pull request in Blockly, so here are a couple of tips:

• You can find tips about contributing to Blockly and how to validate your changes on our developer site.
• We use conventional commits to make versioning the package easier. Make sure your commit message is in the proper format or learn how to fix it.
• If any of the other checks on this PR fail, you can click on them to learn why. It might be that your change caused a test failure, or that you need to double-check the style guide.
  Thank you for opening this PR! A member of the Blockly team will review it soon.

[mikeharv]

Thanks for cleaning this up for us!