MM-64330 - filter abac users in channel invite (#31219)

* MM-64330 - filter abac users in channel invite

* implement cursor functionality for abac user filtering

* remove unnecessary comments

* refactor the backend implementation simplifying the functions

* refactor api to use opts as parameters, rename function

* add missing translation

* remove unnecesary test code

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Co-authored-by: Mattermost Build <build@mattermost.com>

server/channels/app/channel.go

@@ -3965,7 +3965,7 @@ func (a *App) ChannelAccessControlled(c request.CTX, channelID string) (bool, *m
 		return false, nil
 	}
 
-	_, err := a.Srv().Store().AccessControlPolicy().Get(c, channelID)
+	channel, err := a.Srv().Store().Channel().Get(channelID, true)
 	var nfErr *store.ErrNotFound
 	if err != nil && !errors.As(err, &nfErr) {
 		return false, model.NewAppError("ChannelIsAccessControlled", "app.channel.get.app_error", nil, "", http.StatusInternalServerError).Wrap(err)
@@ -3973,7 +3973,7 @@ func (a *App) ChannelAccessControlled(c request.CTX, channelID string) (bool, *m
 		return false, nil
 	}
 
-	return true, nil
+	return channel.PolicyEnforced, nil
 }
 
 func (a *App) handleChannelCategoryName(channel *model.Channel) {