MM-17468 - Improving performance of fetching threads (#11980)

fetchThreads parameter support in the API

app/channel_test.go

@@ -526,7 +526,7 @@ func TestAddChannelMemberNoUserRequestor(t *testing.T) {
 	}
 	assert.Equal(t, groupUserIds, channelMemberHistoryUserIds)
 
-	postList, err := th.App.Srv.Store.Post().GetPosts(channel.Id, 0, 1, false)
+	postList, err := th.App.Srv.Store.Post().GetPosts(model.GetPostsOptions{ChannelId: channel.Id, Page: 0, PerPage: 1}, false)
 	require.Nil(t, err)
 
 	if assert.Len(t, postList.Order, 1) {