feat: accessibility improvements to ActionPopover, SplitButton and MultiActionButton

[robinzigmond]

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Proposed behaviour

• ActionPopover, SplitButton and MultiActionButton should not use the menu and menuitem roles, but simply present buttons in a semantic HTML list
• the consumer should be able to override the aria-label attribute for the main button on ActionPopover should
• no aria-label should be placed on menu items that open a submenu, so that screenreaders read the text of the item rather than a vague word like "actions"

Current behaviour

• ActionPopover, SplitButton and MultiActionButton use ARIA menu roles, which are not semantically appropriate for a simple list of actions/buttons
• It is not possible to override the aria-label of "actions" on the main button for ActionPopover, which may lead to a poor experience for users (potentially many duplicate labels on a page, none of them meaningful for what the component is actually used for)
• There is the same aria-label="actions" on each menu item that opens a submenu, which causes screenreaders to announce the item as "actions" rather than the actual text that a sighted user can read

Checklist

• [X] Commits follow our style guide
• [X] Related issues linked in commit messages if required
• [X] Screenshots are included in the PR if useful
• [X] All themes are supported if required
• [X] Unit tests added or updated if required
• [X] Cypress automation tests added or updated if required
• [X] Playwright automation tests added or updated if required
• [X] Storybook added or updated if required
• [X] Translations added or updated (including creating or amending translation keys table in storybook) if required
• [X] Typescript d.ts file added or updated if required
• [X] Related docs have been updated if required

QA

• [ ] Tested in CodeSandbox/storybook
• [ ] Add new Cypress test coverage if required
• [ ] Carbon implementation matches Design System/designs
• [ ] UI Tests GitHub check reviewed if required

Additional context

Testing instructions

NOTE: marked as requiring UX QA, this is for an accessibility review rather than more general UX. (Nothing should have changed for users who don't use assistive technology.)

[codesandbox-ci[bot]]

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Latest deployment of this branch, based on commit 5895f1cbcc94d6c564d3baa9029ab9c142f84b4e:

Sandbox	Source
carbon-quickstart	Configuration
carbon-quickstart-typescript	Configuration
carbon-quickstart	PR

[harpalsingh]

Did a demo with @tempertemper and update is good.

[carbonci]

:tada: This PR is included in version 127.1.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: