deps: react-router-dom 4 -> 6 (history 5, react-router-bootstrap 0.26)

Removes the Router/Switch/Route/Link/LinkContainer legacy-context
warnings. Keeps the shared history singleton (used outside React by
NotificationsObserver + Utils/location) via unstable_HistoryRouter, and
bridges v6 hooks back to v4-shaped history/match/location props with a
new withRouterCompat HOC so the ~20 class pages stay untouched.

- <Switch> -> <Routes>, component= -> element=
- Authenticated/Public -> guard components (children or <Navigate replace>)
- LocationListener -> useLocation + useEffect function
- regex route /fire/:type(active|archive|alert)/:id -> /fire/:type/:id
- history.listen callback is ({ location }) in history v5

Browser-verified: SPA nav, /subscriptions->/login auth redirect,
deep-link /fire/archive/:id (params), browser back/forward. REST smoke
byte-identical.

imports/ui/components/AuthenticatedNavigation/AuthenticatedNavigation.js

@@ -1,8 +1,8 @@
 /* eslint-disable import/no-absolute-path */
 import React from 'react';
 import PropTypes from 'prop-types';
-import { withRouter } from 'react-router-dom';
 import { LinkContainer } from 'react-router-bootstrap';
+import withRouterCompat from '../withRouterCompat/withRouterCompat';
 /* import { Nav, NavDropdown } from 'react-bootstrap'; */
 import { withTranslation, Trans } from 'react-i18next';
 import { testId } from '/imports/ui/components/Utils/TestUtils';
@@ -39,4 +39,4 @@ AuthenticatedNavigation.propTypes = {
   name: PropTypes.string.isRequired
 };
 
-export default withTranslation()(withRouter(AuthenticatedNavigation));
+export default withTranslation()(withRouterCompat(AuthenticatedNavigation));