Add limitation warning for permission export

Changelog: changed
EE: true

doc/user/admin_area/index.md

@@ -202,6 +202,8 @@ The following data is included in the export:
 - Access level ([Project](../permissions.md#project-members-permissions) and [Group](../permissions.md#group-members-permissions))
 - Date of last activity ([introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/345388) in GitLab 14.6). For a list of activities that populate this column, see the [Users API documentation](../../api/users.md#get-user-activities-admin-only).
 
+Only the first 100,000 user accounts are exported.
+
 ![user permission export button](img/export_permissions_v13_11.png)
 
 #### Users statistics

ee/app/views/admin/users/_admin_export_user_permissions.html.haml

 - return unless current_user&.can?(:export_user_permissions)
 
-= link_to admin_user_permission_exports_path(format: :csv), { class: 'gl-button btn btn-default btn-icon', data: { toggle: "tooltip", placement: "top", container: "body" }, title: s_("AdminUsers|Export permissions as CSV") } do
+= link_to admin_user_permission_exports_path(format: :csv), { class: 'gl-button btn btn-default btn-icon', data: { toggle: "tooltip", placement: "top", container: "body" }, title: s_("AdminUsers|Export permissions as CSV (max 100,000 users)") } do
   .gl-button-icon
     = sprite_icon('upload')

locale/gitlab.pot

@@ -2768,7 +2768,7 @@ msgstr ""
 msgid "AdminUsers|Delete user and contributions"
 msgstr ""
 
-msgid "AdminUsers|Export permissions as CSV"
+msgid "AdminUsers|Export permissions as CSV (max 100,000 users)"
 msgstr ""
 
 msgid "AdminUsers|External"