TriggerJobOpts: refactor EDMVersion flag

Frank Winklmeierrequested to merge
fwinkl/athena:edmversion into master

Move the code to discover the EDMVersion flag in bytestream files to TrigEDMConfig.Utils and cache the result for a given bytestream file. This ensures we are only reading the file once. This is especially important for mixed old/new job options where the flags are not being locked and hence this function is called every time code reads the EDMVersion flag.

cc @rbielski

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