JobSub

Laid out in #22099 is a scenario where an improper constraint was passed to condor by the jobsub server, and the result was that thousands of jobs were removed by one command. Come up with a sanity check of constraints passed in, so we make sure we're only passing in ones that make sense.

Examples are:

• There should never be a "=". It should be "=="

We're having a meeting in a few days to discuss other examples. They'll be added to this ticket as we see fit.