Draft: Update test after changes in Hlt2 key generation for master

Miroslav Saurrequested to merge
msaur_cherrypick_dfazzini_fix_hlt2key_generation into master

See details at !4056 (closed)

Part of the set: LHCb!4800 (closed) !4131 (closed)

FYI @cagapopo

Edited by Miroslav Saur

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