Fix gocyclo errors

[mrpalide]

After fixing ticket #1865 and adding gocyclo to formatting process in CI (and local), we get about 14 errors there!
So we just ignore them for now, but should solve them.
Those ignored errors could be founding by TODO: fix gocyclo error. or gocyclo:ignore, e.g. :

// TODO: fix gocyclo error.
//
//gocyclo:ignore
func makeTree() {

[0pcom]

The worst gocyclo errors are I believe caused by the actual reward system UI - i think..

I'm planning to re-do it eventually, to resolve those errors. It's safe to ignore any gocyclo errors related to the reward system UI for now because it's not core functionality that users have to deal with.