MM-14897: Changes to be able to add and remove groups from channels. (#10794)

* MM-15162: Changes for LDAP groups removals phase.

* MM-14897: Changes to be able to add and remove groups from channels.

* Update model/client4.go

* MM-14897: PR-requested change to string interpolation.

web/params.go

@@ -21,50 +21,51 @@ const (
 )
 
 type Params struct {
-	UserId              string
-	TeamId              string
-	InviteId            string
-	TokenId             string
-	ChannelId           string
-	PostId              string
-	FileId              string
-	Filename            string
-	PluginId            string
-	CommandId           string
-	HookId              string
-	ReportId            string
-	EmojiId             string
-	AppId               string
-	Email               string
-	Username            string
-	TeamName            string
-	ChannelName         string
-	PreferenceName      string
-	EmojiName           string
-	Category            string
-	Service             string
-	JobId               string
-	JobType             string
-	ActionId            string
-	RoleId              string
-	RoleName            string
-	SchemeId            string
-	Scope               string
-	GroupId             string
-	Page                int
-	PerPage             int
-	LogsPerPage         int
-	Permanent           bool
-	RemoteId            string
-	SyncableId          string
-	SyncableType        model.GroupSyncableType
-	BotUserId           string
-	Q                   string
-	IsLinked            *bool
-	IsConfigured        *bool
-	NotAssociatedToTeam string
-	Paginate            *bool
-	IncludeMemberCount  bool
+	UserId                 string
+	TeamId                 string
+	InviteId               string
+	TokenId                string
+	ChannelId              string
+	PostId                 string
+	FileId                 string
+	Filename               string
+	PluginId               string
+	CommandId              string
+	HookId                 string
+	ReportId               string
+	EmojiId                string
+	AppId                  string
+	Email                  string
+	Username               string
+	TeamName               string
+	ChannelName            string
+	PreferenceName         string
+	EmojiName              string
+	Category               string
+	Service                string
+	JobId                  string
+	JobType                string
+	ActionId               string
+	RoleId                 string
+	RoleName               string
+	SchemeId               string
+	Scope                  string
+	GroupId                string
+	Page                   int
+	PerPage                int
+	LogsPerPage            int
+	Permanent              bool
+	RemoteId               string
+	SyncableId             string
+	SyncableType           model.GroupSyncableType
+	BotUserId              string
+	Q                      string
+	IsLinked               *bool
+	IsConfigured           *bool
+	NotAssociatedToTeam    string
+	NotAssociatedToChannel string
+	Paginate               *bool
+	IncludeMemberCount     bool
 }
 
 func ParamsFromRequest(r *http.Request) *Params {
@@ -249,6 +250,7 @@ func ParamsFromRequest(r *http.Request) *Params {
 	}
 
 	params.NotAssociatedToTeam = query.Get("not_associated_to_team")
+	params.NotAssociatedToChannel = query.Get("not_associated_to_channel")
 
 	if val, err := strconv.ParseBool(query.Get("paginate")); err == nil {
 		params.Paginate = &val