LDAP: Restore test user mapping functionality (#110841)
* Migrate LdapPage from connect() to React-Redux hooks
* Convert LDAP debug page into a drawer and hook it into settings
* prettier
* Use the Text component and make the input and button look like they do on the main settings page.
* Bring back isLoading and put in a LoadingPlaceholder
* i18n-extract
* rejigger
* linter fix
(cherry picked from commit 585b53bc7d)
Co-authored-by: John Troy <jtroy@users.noreply.github.com>
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