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As disscussed in Wallaby PTG[1], QA and Horizon team decided to move the horizon dashboard test from tempest-horizon to Tempest. As next step, we can remove the tempest-horizon plugin which will ease the maintaince of horizon tempest test. [1] https://etherpad.opendev.org/p/qa-wallaby-ptg Change-Id: Id2ced856a41548a0b49e594ee5fed6ed28785f24