Draft: test: add spec for SlackIntegration instance alias

Rezrequested to merge
workloads/45777a38bc9 into master

This MR was created by Duo in Session 1127113

Changes

  • Add test coverage for the instance-level SlackIntegration alias scenario when duplicating integrations
  • Ensure the right side of the || condition in after_build_from_integration is properly tested
Edited by Rez

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