feat(toast): set role to status

[nuria1110]

Proposed behaviour

• Set role of "status" to Toast component.
• No axe violation when Toast is rendered.
• No typo in Select onKeyDown prop description.
• Links in 'Related Components' section in Alert docs go to component's docs page.

Current behaviour

• Toast component has no semantic meaning, this causes an axe violation on render: "All page content should be contained by landmarks".
• Typo in Select onKeyDown prop description.
• Links in 'Related Components' section in Alert docs go to default story or are broken.

Checklist

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

QA

• [ ] Tested in provided StackBlitz sandbox/Storybook
• [ ] Add new Playwright test coverage if required
• [ ] Carbon implementation matches Design System/designs
• [ ] UI Tests GitHub check reviewed if required

Additional context

Testing instructions