CITest: migrate Trigger_athena_MC test

Migrate the Trigger_athena_MC test from TestConfig to CITest. Drop the usage of the runTrigCI.py wrapper script as these functions (e.g. private run directory) are taken care of by CITest already. This only affects the master branch. Both new and old job will run in parallel for a few days. Migration of the other trigger tests will follow.

Relates to ATLINFR-4360. cc @vmartin @okumura @rbielski @tbuanes

AtlasTest/CITest/Athena.cmake

@@ -40,6 +40,14 @@ atlas_add_citest( Egamma
    SCRIPT ut_egammaARTJob_test.sh )
 
 
+#################################################################################
+# Trigger
+#################################################################################
+
+atlas_add_citest( TriggerMC
+   SCRIPT test_trigAna_RDOtoRDOTrig_v1Dev_build.py )
+
+
 # TODO: We stop here for now (migration ongoing...)
 return()
 
@@ -103,9 +111,6 @@ atlas_add_citest( Trigger_athenaHLT_decodeBS
 atlas_add_citest( Trigger_athenaHLT_data
    SCRIPT test_trigP1_v1PhysP1_build.py )
 
-atlas_add_citest( Trigger_athena_MC
-   SCRIPT test_trigAna_RDOtoRDOTrig_v1Dev_build.py )
-
 atlas_add_citest( Trigger_athena_data
    SCRIPT test_trig_data_v1Dev_build.py )