enable remote enrollment for LDAP users (#2609)

* add LDAP remote enrollment toggles to settings

* add form inputs

* update frontend API types

* update form schema

* update copy

* hide second checkbox until the first one is checked

* formatting

* disable LDAP sync section if not all required inputs are filled

* refactor required fields check for easier sharing between sections

* disable remote enrollment section when SMTP or LDAP is not configured

* add ldap_configured helper mirroring frontend logic

* extend settings validation

* expand validation

* disable toggle if required fields are not filled

* add explanation

* validate if ldap can be enabled

* update ui submodule

* make validation consistent in ldap settings form

* also match backend validation with frontend

* test ldap validation in API

* formatting

* update user model to track remote enrollment status

* update logic for calculating enrollment status

* test enrollment status updates in LDAP user lifetime

* add helper for sending enrollment invites to LDAP users

* send invite emails when adding new LDAP users

* fix is_enrolled check order to handle LDAP login password sync

* add tests for LDAP enrollment

* remove comment

* add second login/sync test

* formatting

* update ui submodule

* send invites after user create transaction is commited

* fix settings save query

* update ui submodule

* update button text

* update dependencies

* avoid sending duplicate emails

* update ui submodule

* use a different approach to avoid duplicate codes

Author: wojcik91