ci: add downstream pipeline for stress tests

Summary

• ci: add downstream pipeline for stress tests

Add stage to run stress tests in downstream pipeline for each commit

RFC: https://docs.google.com/document/d/1KB8zIltJK2stjgXlf3It7BxzB9ML1V9zeZ6hUn9-9cc/edit#heading=h.uz5ik44kpw3d

Target branch: master

Changes should be cherry-picked to 24.2: no

Docs follow-up: not necessary