MM-19337 Enable users to view archived channels (#12995)

* First pass at searching archived channels

* Create endpoint for archived channels

* Update test for GetPublicChannelsForTeam

* Fix unit test for archived channels

* Rename includeDeleted to onlyDeleted

* Remove new /archived endpoint in favour of existing /deleted endpoint

* Fix broken test

* Remove manage team permission from /deleted endpoint

* Fix deletedChannels test

* Test for searching archived channels

* Only return private deleted channels user was a member of

* SearchArchivedChannels also searches private channels (user is a member of)

* Remove for loop to simplify append

* Remove userId from Client4 searcArchivedChannels

model/client4.go

@@ -2235,6 +2235,16 @@ func (c *Client4) SearchChannels(teamId string, search *ChannelSearch) ([]*Chann
 	return ChannelSliceFromJson(r.Body), BuildResponse(r)
 }
 
+// SearchArchivedChannels returns the archived channels on a team matching the provided search term.
+func (c *Client4) SearchArchivedChannels(teamId string, search *ChannelSearch) ([]*Channel, *Response) {
+	r, err := c.DoApiPost(c.GetChannelsForTeamRoute(teamId)+"/search_archived", search.ToJson())
+	if err != nil {
+		return nil, BuildErrorResponse(r, err)
+	}
+	defer closeBody(r)
+	return ChannelSliceFromJson(r.Body), BuildResponse(r)
+}
+
 // SearchAllChannels search in all the channels. Must be a system administrator.
 func (c *Client4) SearchAllChannels(search *ChannelSearch) (*ChannelListWithTeamData, *Response) {
 	r, err := c.DoApiPost(c.GetChannelsRoute()+"/search", search.ToJson())