MM-45317: global drafts endpoints and ws events (#20614)

* MM-23881: global drafts endpoints and ws events

Adds endpoints:
- create/update drafts
- delete draft
- get drafts

Adds WS events:
- draft_updated
- draft_created
- draft_deleted

* Ordering and WS event name fixes

* Adds PostID to the drafts table

In the future the drafts will include edited posts, this commit adds the
post id in the combined pkey of the table.

* Fixes route for deleting a thread draft

* Fixes failed checks

* Fixes migrations

* Fixes migration

* Extract translation strings

* Removes PostID since we won't sync editing posts

* Fixes tests

* Fixes i18n

* Update migrations for global drafts

* update branch with latest master changes

* Add feature flag for global drafts

* Set global drafts feature flag default to true

* Added support for files in drafts

* Fix failing i18n check

* Added support for deleting files in drafts

* Revert "Added support for deleting files in drafts"

This reverts commit 45dfd04a760359de2e8814d652c9ef46daf994f6.

* Triggering new test server

* Add config setting 'AllowSyncedDrafts' for syncing drafts with server

* Triggering new test server

* Triggering new test server

* Add guard for config setting and add initial tests

* Fix i18n and lint errors

* Triggering new test server

* Add tests for drafts

* fix lint issues

* Add tests for model/draft

* Triggering new test server

* Triggering new test server

* Trigger new test server

* Address PR comments

* Change left join to regular join in GetDraftsForUser

* Fix broken test

Maybe consider adding an inclDeleted field if we want to get deleted drafts in the future

* fix translations

* Add store tests for drafts

* fix test naming

* remove comment

* update migrations

* set feature flag default to false

* update migrations

Co-authored-by: Mylon Suren <mylonsuren@gmail.com>
Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

model/websocket_message.go

@@ -76,6 +76,9 @@ const (
 	WebsocketEventThreadFollowChanged                 = "thread_follow_changed"
 	WebsocketEventThreadReadChanged                   = "thread_read_changed"
 	WebsocketFirstAdminVisitMarketplaceStatusReceived = "first_admin_visit_marketplace_status_received"
+	WebsocketEventDraftCreated                        = "draft_created"
+	WebsocketEventDraftUpdated                        = "draft_updated"
+	WebsocketEventDraftDeleted                        = "draft_deleted"
 	WebsocketEventAcknowledgementAdded                = "post_acknowledgement_added"
 	WebsocketEventAcknowledgementRemoved              = "post_acknowledgement_removed"
 )