Add trigger ART tests from HITS

Adding three ART build tests, two for ATR-19810:

• HITtoRDO with serial athena, then RDOtoRDOTrigger with threads=1
• same as above, but all with serial athena (for reference)

and one for ATR-19893:

• HITtoRDO in master, then RDOtoRDOTrigger in 21.0, then RAWtoESD+ESDtoAOD in master

Tagging @hartj, @wiedenma, @smh