AthenaPoolMultiTest: Avoid AttributeList copy.

Copying an AttributeList is potentially not thread-safe. Fix an instance of that here (which was also a memory leak!).

This merge request affects 1 package:

• AtlasTest/DatabaseTest/AthenaPoolMultiTest

added Test master review-pending-level-1 labels

CI Result SUCCESS (hash 105374ac)

	Athena	AthSimulation
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 10240]

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit 9aa17bef

added sweep:ignore label