Fix accessibility violation in settings-block shared component

What does this MR do and why?

Fix accessibility violation in vue_shared/settings-block.vue detected while adding specs in !174272 (merged)

Fixes aria-allowed-role axe violation https://dequeuniversity.com/rules/axe/4.9/aria-allowed-role?application=axeAPI

Closes #507300 (closed)

Changelog: fixed

References

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MR acceptance checklist

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Screenshots or screen recordings

N/A

How to set up and validate locally

1. Run yarn storybook:start
2. Verify the settings block story