Sweeping !55583 from master to 22.0. xAODTrigger+TrigCompositeUtils: Preparing for a possible migration to 64-big sgkey_t.

Atlas Nightlybuildrequested to merge
cherry-pick-e9f74324d24-22.0 into 22.0

xAODTrigger+TrigCompositeUtils: Preparing for a possible migration to 64-big sgkey_t.

See merge request !55583 (merged)

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