[ATR-27227] Add service creation to trigger xAODConfig svc when not in INFILE mode

Tim Martin requested to merge tamartin-23.0-patch-91587 into 23.0

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.

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