refactor(template-no-abstract-roles): source abstract-role list from aria-query

[johanrd]

This PR is part of a broader a11y parity audit comparing our rules against jsx-a11y, vue-a11y, angular-eslint-template, and lit-a11y.

Replaces the hand-maintained list of 12 abstract ARIA roles with a derivation from aria-query:

const { roles } = require('aria-query');
const PROHIBITED_ROLE_VALUES = new Set(
  [...roles.keys()].filter((role) => roles.get(role).abstract)
);

aria-query is already a dependency (used by several other rules). Future WAI-ARIA additions of abstract roles flow in automatically on aria-query upgrade instead of requiring a hand edit here.

Before/after

Hand list (12 roles): command, composite, input, landmark, range, roletype, section, sectionhead, select, structure, widget, window.

aria-query's roles.keys().filter(r => roles.get(r).abstract) yields the same 12. No behavioural change.

Spec reference

• WAI-ARIA 1.2 5.3.1 - Abstract Roles: "The following roles are used to support the WAI-ARIA Roles Model... They are not intended for use by user agents or authors."

Part of a cleanup campaign migrating hand-maintained lists in this plugin to authoritative sources where available. Related refactors migrate aria-unsupported-elements to aria-query's dom.reserved and no-invalid-role to aria-query's role set.