TriggerTest: do not keep RDO_TRIG.pool.root output

Bertrand Martin Dit Latourrequested to merge
martindl/athena:24.0_ART_noRDOTRIG into 24.0

Hello,

This is a repetition of !79149 (merged), this time for the TriggerTest package. To reduce the disk footprint of trigger ART tests (ATR-31041), this MR selectively keeps expert-monitoring.root and rootcomp.root as output ROOT files, instead of *.root which captures RDO_TRIG.pool.root produced by the test. We save about 2 GB per test, times 12 tests, times 2 (24.0 and main), so about 50 GB per day, which is quite considerable. I only touched the specialised tests like "slice" tests, not the more generic ones.

Tagging @lbeemste .

Cheers, Bertrand

Edited by Bertrand Martin Dit Latour

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