[MM-56399][MM-56397][MM-56456][MM-56269] Various changes for user reporting for admins (#25839)

* [MM-56399] Add user count endpoint for reporting

* [MM-56397] Added search term to user report filter

* Missing translation

* [MM-56456] Rename up/down to prev/next for reporting cursoring

* [MM-56269] Add DeleteAt, MfaActive and AuthService fields to UserReport

* PR feedback

* Fix test

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

server/i18n/en.json

@@ -6622,6 +6622,10 @@
     "id": "app.recover.save.app_error",
     "translation": "Unable to save the token."
   },
+  {
+    "id": "app.report.get_user_count_for_report.store_error",
+    "translation": "Failed to fetch user count."
+  },
   {
     "id": "app.report.get_user_report.store_error",
     "translation": "Failed to fetch user report."