Restore QueryLimiting threshold in epic specs

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Due to the extra queries executed by Generate a work item for every epic created (#434529 - closed) we had to increase the QueryLimiting thresholds in several specs. This should be reverted when syncing between legacy epics and work items is no longer needed.

List of specs to revise

• ee/spec/requests/api/graphql/mutations/issues/promote_to_epic_spec.rb#L55
• ee/spec/requests/api/epics_spec.rb#L862
• ee/spec/features/issues/user_bulk_edits_issues_spec.rb
• ee/spec/features/projects/issues/user_creates_issue_spec.rb
• ee/spec/requests/api/graphql/mutations/issues/set_epic_spec.rb