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Include gFex in HLTSeeding data path

Rafal Bielski requested to merge rbielski/athena:hltseeding-dont-skip-gfex into 22.0

Revert the removal of gFex from HLTSeeding path for Run-3 data. This means running HLT on Run-3 data with enableL1CaloPhase1=True will now also process gFex TOBs in HLTSeeding code, converting them into TrigRoiDescriptors and producing corresponding Decisions. Although there is no chain in HLT menu using the gFex TOBs for seeding (all gFex-seeded chains are full-scan), this provides validation of the gFex data which is crucial to ensure HLT chains are running based on good inputs.

Since we do currently have some bad data expected, this MR needs !56819 (merged) which is masking them upstream. General strategy for handling such cases remains to be discussed, but it's independent of this MR.

Jira: ATR-25495

Edited by Rafal Bielski

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