clear_duplicate_history command feature: allow to exclude some fields from `diff_against` check

[MaximZemskov]

Hey.

clear_duplicate_history command deletes only absolute identical instances, but there is an issue: if an instance has auto updated fields (e.g. version, updated_at) the command is not going to delete these duplicates

Is there a way to add a feature which would allow providing an exclude_list arg to the command and passing it to the diff_against method?

[rossmechanic]

@MaximZemskov, absolutely. Feel free to add a PR to update the clean_duplicate_history management command to allow for excluded fields. Think you would just have to update the diff_against method to ignore excluded fields

[MaximZemskov]

@rossmechanic #680