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Fix the treatment of unmatched cTaus in HLTSeeding

Rafal Bielski requested to merge rbielski/athena:fix-ctau-unmatched into 22.0

Instead of discarding eTaus which have no matching jTaus as a cTau candidate, treat them as a perfectly-isolated cTau candidate. This is to match the firmware implementation of the matching.

Also fix a bug noticed while changing the code where a signed integer eTau.iEta() (which has a value between -25 and 24) was implicitly casted to unsigned integer.

Closes ATR-25927

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