[EE] Support additional LabelsFinder parameters for group labels

Jan Provaznikrequested to merge
ee-jprovazn-ancestor-labels+ into master

This is EE version of gitlab-ee!17447

Also because LabelsFinder now supports both only_group_labels and include_ancestor_groups we can use LabelsFinder in all cases (instead of if params[:only_group_labels]).

Edited by Coung Ngo

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