[MM-55726] Create batch report worker, add batch report job for exporting users to CSV (#25832)

* Split out migration logic and create generic BatchWorker

* WIP

* WIP

* POC batch reporting

* Oops

* Job hookup

* Working export to file

* PR feedback

* Merge'd

* Fix error handling

* Add API to start report, translations, couple fixes

* Add DMs to send reports to users

* Merge'd

* Update types

* A bit of cleanup

* Some fixes

* Add missing API doc

* PR feedback

* Fix generated

* Fix bug with post creation

* PR feedback

* Add some tests

* PR feedback

* Fix lint

* Some test changes

* Fix tests

* Add comment to explain why we forcibly stop

* Rework of some tests

* Batch report test

* Restrict batch exports to Pro and Enterprise licenses

* Fix erroneous comment

---------

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

server/public/model/job.go

@@ -38,6 +38,7 @@ const (
 	JobTypeCleanupDesktopTokens         = "cleanup_desktop_tokens"
 	JobTypeDeleteEmptyDraftsMigration   = "delete_empty_drafts_migration"
 	JobTypeRefreshPostStats             = "refresh_post_stats"
+	JobTypeExportUsersToCSV             = "export_users_to_csv"
 
 	JobStatusPending         = "pending"
 	JobStatusInProgress      = "in_progress"