Audit usage of explicit `aria-label` on Button component implementations

[afercia]

Description

It appears that in some cases some Button components use an explicit aria-label prop to render an aria-label HTML attribute, which in turn determines the icon button tooltip (if it's an icon button). Example:

https://github.com/WordPress/gutenberg/blob/91272a2b4bfca1f75a6754a0f3689c3a42988f0c/packages/block-editor/src/components/border-radius-control/linked-button.js#L12-L21

This pattern should be audited across the entire codebase as it's not a best practice.

Setting an explicit aria-label signals two possible cases, both less than ideal:

• The aria-label is used in a way that the accessible name mismatches the Button text or tooltip. This is not OK for accessibility.
• The aria-label is just unnecessary, like in the example above. In that case, the wrapping Tooltip component uses the same label variable used for aria-label. In this case, the Tooltip component can be removed and the variable passed to the label prop of the Butotn.

Step-by-step reproduction instructions

N/A

Screenshots, screen recording, code snippet

No response

Environment info

No response

Please confirm that you have searched existing issues in the repo.

• [x] Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

• [x] Yes

[ciampo]

Related to https://github.com/WordPress/gutenberg/pull/66021

cc @WordPress/gutenberg-components