On the profile edit screen in ``wp-admin, the username was previously displayed using an input field with the `disabled` attribute. This field was skipped by screen readers, which leads to a loss of information for visually impaired users. This changeset switches it to a `readonly` attribute, which is exactly the purpose of this field.
Props roytanck, audrasjb, rajinsharwar, joedolson.
Fixes#60774.
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