TriggerJobOpts: delete obsolete configurationSourceList flag
Delete the obsolete legacy TriggerFlags.configurationSourceList
flag
and related configuration code. Also delete the readLVL1FromJSON
flag,
which was only required during the Run-3 migration while we had to
support old and new menus.
Remove references to these flags in job options or delete them entirely if they seem obsolete.
Edited by Frank Winklmeier