[Recommendation] Disable a11y-overlay plugins

[aristath]

Recommendation title

Disable a11y-overlay plugins

Recommendation description

All a11y-overlay plugins don't actually fix any a11y issues, they just mask them.
We should try and detect if they have such a plugin installed on their site, and in case they do, recommend disabling it.

Recommendation category

configuration

Other category

No response

Required capability

No response

Onboarding recommendation

false

Points to award

1

Recommendation priority

medium

Dismissable

true

Snoozable

true

Additional Information

No response