PersistentDataModel: Remove not-thread-safe annotations from AthenaAttributeList.

The thraed-safety problems of AttributeList have now been fixed in CORAL. Remove not-thread-safe annotations from AthenaAttributeList.

This merge request affects 1 package:

• Database/PersistentDataModel

Adding @ssnyder ,@mnowak as watchers

added Database master review-pending-level-1 labels

CI Result SUCCESS (hash a3967426)

	Athena	AthSimulation	AthGeneration	AnalysisBase
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
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 21901]

added review-pending-level-2 label and removed review-pending-level-1 label

Changes look reasonable, but asking L2 to take a look as I don't have much experience with multi-threading.

Cheers Nathan (L1)

added review-approved label and removed review-pending-level-2 label

merged

mentioned in commit 49b6a37d

added sweep:ignore label