Cleaned up and simplified the config/env.sh and util/build.sh

• We should limit the number of new environment variables. They increase complexity which should be mostly absorbed by using containers.
• Any new environment variables should be set via the ci yml file or defined the UI. https://docs.gitlab.com/ee/ci/variables/README.html#custom-environment-variables
• Removed dummy scripts
• Removed dvmp dummy jobs.
• Fixed dvmp output data. Note the out artifacts should go in results/dvmp if they are in the dvmp directory. This will just make things easier later on for collecting and summarizing results.
• updated dvmp/scripts/run_generator_instance.sh
• Added dvmp.sh to run geant4/reconstruction. Note dvmp/dvmp.sh could be named something more specific, like dvmp/dvmp_barrel_decays.sh depending on the input, analysis, etc...

added framework maintenance labels

added 2 commits

• d1cce80e - Removed dummies
• 3d87746c - Removed dvmp dummies.

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@sly2j I have made changes to some of your scripts.

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• 9b1677cb - Fixed output data_path

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• eef826cf - debug

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• b2a4be9e - modified: scripts/run_generator_instance.sh

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• 5c28e6df - Added dvmp.sh to run a test

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• 1070ad09 - modified: config.yml

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• a438e84b - Cleaned up and simplified the config/env.sh and util/build.sh

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merged