[ATR-27227] Add service creation to trigger xAODConfig svc when not in INFILE mode
This ensures that the backend is setup when running the trigger xAODConfigSvc, but not in the usual INFILE
mode.
In addition - minor refactor to include the two prescale condalgs within the TrigConfigSvcCfg
function. This function now schedules everything. Anywhere which does not need everything is free to continue to call the individual algs.