Stop supporting getenv=true in HTCondor workflows
Using `getenv = true` in HTCondor workflows makes job failures hard(er) to debug, and makes the job environment extremely difficult to reproduce. Support for this inside DAGMan workflows has also been disabled by default as of HTCondor 10.7, meaning it will be part of the 11.0 Long Term Support release as well. We should lead our users away from using `getenv = true` with a combination of warnings, assisted development, and finally reconfiguring HTCondor to not support it at all.
epic