[MM-20804] Add "Unarchive Channel" option to the channel info screen (#13349)

* add websocket hooks to restoreChannel

* add userId to call in api4

* add constant

* undo changes in en.json

* add constants to en.json

* delete  code for deleting webhooks

* Update i18n/en.json

Co-Authored-By: Ben Schumacher <ben.schumacher@mattermost.com>

* restore channel ordering

* delete Props

* Update app/channel.go

Co-Authored-By: Ben Schumacher <ben.schumacher@mattermost.com>

* Update app/channel.go

Co-Authored-By: Ben Schumacher <ben.schumacher@mattermost.com>

* change message format

* move WS message right after invalidate

* manually reorder en.json entry

* reorder en.json

* undelete to restore

* update en.json ordering

* update wording

* Update model/post.go

Co-Authored-By: Saturnino Abril <saturnino.abril@gmail.com>

* Update model/websocket_message.go

Co-Authored-By: Saturnino Abril <saturnino.abril@gmail.com>

* gofmt

* undeleted to restored

* add test to success case

* delete repeated test

Co-authored-by: Ben Schumacher <ben.schumacher@mattermost.com>
Co-authored-by: Saturnino Abril <saturnino.abril@gmail.com>
Co-authored-by: mattermod <mattermod@users.noreply.github.com>

model/post.go

@@ -38,6 +38,7 @@ const (
 	POST_CONVERT_CHANNEL        = "system_convert_channel"
 	POST_PURPOSE_CHANGE         = "system_purpose_change"
 	POST_CHANNEL_DELETED        = "system_channel_deleted"
+	POST_CHANNEL_RESTORED       = "system_channel_restored"
 	POST_EPHEMERAL              = "system_ephemeral"
 	POST_CHANGE_CHANNEL_PRIVACY = "system_change_chan_privacy"
 	POST_ADD_BOT_TEAMS_CHANNELS = "add_bot_teams_channels"
@@ -264,6 +265,7 @@ func (o *Post) IsValid(maxPostSize int) *AppError {
 		POST_DISPLAYNAME_CHANGE,
 		POST_CONVERT_CHANNEL,
 		POST_CHANNEL_DELETED,
+		POST_CHANNEL_RESTORED,
 		POST_CHANGE_CHANNEL_PRIVACY,
 		POST_ME,
 		POST_ADD_BOT_TEAMS_CHANNELS:

model/websocket_message.go

@@ -18,6 +18,7 @@ const (
 	WEBSOCKET_EVENT_CHANNEL_CONVERTED       = "channel_converted"
 	WEBSOCKET_EVENT_CHANNEL_CREATED         = "channel_created"
 	WEBSOCKET_EVENT_CHANNEL_DELETED         = "channel_deleted"
+	WEBSOCKET_EVENT_CHANNEL_RESTORED        = "channel_restored"
 	WEBSOCKET_EVENT_CHANNEL_UPDATED         = "channel_updated"
 	WEBSOCKET_EVENT_CHANNEL_MEMBER_UPDATED  = "channel_member_updated"
 	WEBSOCKET_EVENT_DIRECT_ADDED            = "direct_added"