Investigate config string for versions

The stored config string for versions seems to vary a lot: post EVG-6270 there's a config with ~200,000 lines, configs from today seem about ~110,000 lines, the config from https://evergreen.mongodb.com/version/mongodb_mongo_master_c68b233864234fa0a4f9fcc71b775f896d225957 mid-July was about ~75,000 lines. All of these seem to have expanded task tags (and various other differences). This is difficult to investigate given the huge volume of files, but should be done separate of EVG-6270 to simplify the problem at hand.