Pr 9039 (#9187)

* MM-11065: Allow to search and get archived channels from the API

* Fixing more tests

* Add some unit tests

* Add includeDeleted parameter to session permissions check function

* More test fixing

* Adding archive channels list in channels search

* Add restriction for archived channel edition

* Reverting permissions checks modification

* Changed the query parameter to include_deleted

* Enable search archive channels as true by default

* Adding tests for verify search on deleted channels

* Allowing to override archive channels during the imports

* Fixed test

* Search in archive channels from the API must be explicitly requested

* Removing includeDeleted parameter from GetChannelByName and GetChannelByNameForTeam

* Back to ViewArchivedChannels config

* Fixing tests

* Reverting GetChannelByName parameter

* Add include deleted parameter on GetChannel functions in plugins api

* Fixing tests

plugin/api.go

@@ -108,10 +108,10 @@ type API interface {
 	GetChannel(channelId string) (*model.Channel, *model.AppError)
 
 	// GetChannelByName gets a channel by its name, given a team id.
-	GetChannelByName(teamId, name string) (*model.Channel, *model.AppError)
+	GetChannelByName(teamId, name string, includeDeleted bool) (*model.Channel, *model.AppError)
 
 	// GetChannelByNameForTeamName gets a channel by its name, given a team name.
-	GetChannelByNameForTeamName(teamName, channelName string) (*model.Channel, *model.AppError)
+	GetChannelByNameForTeamName(teamName, channelName string, includeDeleted bool) (*model.Channel, *model.AppError)
 
 	// GetDirectChannel gets a direct message channel.
 	GetDirectChannel(userId1, userId2 string) (*model.Channel, *model.AppError)