[hail] add jar-only hail build job (#9904)
[hail] add jar-only hail build job (#9904)

Building the JAR only takes 5 minutes. Query and Shuffler don't need the other stuff, so it's better
for services team if we can skip all that. I don't really care much about the added 5 compute
minutes. It's worth the increase in developer velocity.
hail-is/hail,hail-is/hail,hail-is/hail,hail-is/hail,hail-is/hail,hail-is/hail,hail-is/hail,hail-is/hail