Extract params filtering logic

ee/app/assets/javascripts/approvals/components/app.vue

.../javascripts/approvals/components/approvers_list_item.vue

...s/javascripts/approvals/components/hidden_groups_item.vue

...s/approvals/components/mr_edit/mr_rules_hidden_inputs.vue

ee/app/assets/javascripts/approvals/components/rule_form.vue

ee/app/assets/javascripts/approvals/constants.js

ee/app/assets/javascripts/approvals/mappers.js

...lers/ee/projects/merge_requests/application_controller.rb

ee/app/finders/approval_rules/group_finder.rb

ee/app/presenters/approval_rule_presenter.rb

ee/app/services/approval_rules/params_filtering_service.rb

ee/app/services/approval_rules/update_service.rb

ee/app/services/ee/merge_requests/base_service.rb

ee/changelogs/unreleased/10356-private-group-handling.yml

ee/lib/api/project_approval_rules.rb

ee/lib/ee/api/entities.rb

...c/features/merge_request/user_sets_approval_rules_spec.rb

ee/spec/finders/approval_rules/group_finder_spec.rb

...ures/api/schemas/public_api/v4/project_approval_rule.json

...ascripts/approvals/components/approvers_list_item_spec.js