Add TriggerTest ART tests for FTK with v8 menu

Julie Hart Kirkrequested to merge
hartj/athena:TriggerTest-FTKv8 into 21.3

new file: Trigger/TrigValidation/TriggerTest/test/test_mc_pp_v8_ftk_build.sh new file: Trigger/TrigValidation/TriggerTest/test/test_mc_pp_v8_ftk_grid.sh

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