[MM-53428] Delete empty drafts on upsert (#24046)

* [MM-53428] Delete empty drafts on upsert

* Add migrations to fix existing drafts

* Fix CI

* Delete empty drafts entirely from the DB

* Fix lint

* Implement batch migration for deleting drafts

* Missing store layers

* Add updated mock

* Remove unnecessary test

* PR feedback

* Add check for cluster migration

* Fix MySQL

* Don't check for len<2

* Bit of PR feedback

* Use query builder for parameters

* PR feedback

* More PR feedback

* Merge'd

* unit test GetLastCreateAtAndUserIdValuesForEmptyDraftsMigration

* simplified builder interface

* fix DeleteEmptyDraftsByCreateAtAndUserId for MySQL

* rework as batch migration worker

* fix typo

* log ip address on version mismatches too

* simplify reset semantics

* remove trace log in favour of low spam

* document parameters for clarity

---------

Co-authored-by: Mattermost Build <build@mattermost.com>
Co-authored-by: Jesse Hallam <jesse.hallam@gmail.com>

server/channels/app/server.go

@@ -40,6 +40,7 @@ import (
 	"github.com/mattermost/mattermost/server/v8/channels/jobs"
 	"github.com/mattermost/mattermost/server/v8/channels/jobs/active_users"
 	"github.com/mattermost/mattermost/server/v8/channels/jobs/cleanup_desktop_tokens"
+	"github.com/mattermost/mattermost/server/v8/channels/jobs/delete_empty_drafts_migration"
 	"github.com/mattermost/mattermost/server/v8/channels/jobs/expirynotify"
 	"github.com/mattermost/mattermost/server/v8/channels/jobs/export_delete"
 	"github.com/mattermost/mattermost/server/v8/channels/jobs/export_process"
@@ -1573,6 +1574,11 @@ func (s *Server) initJobs() {
 		s3_path_migration.MakeWorker(s.Jobs, s.Store(), s.FileBackend()),
 		nil)
 
+	s.Jobs.RegisterJobType(
+		model.JobTypeDeleteEmptyDraftsMigration,
+		delete_empty_drafts_migration.MakeWorker(s.Jobs, s.Store(), New(ServerConnector(s.Channels()))),
+		nil)
+
 	s.Jobs.RegisterJobType(
 		model.JobTypeExportDelete,
 		export_delete.MakeWorker(s.Jobs, New(ServerConnector(s.Channels()))),