ATLASRECTS-4604: EMBremCollectionBuilder reentrant

Make EMBremCollectionBuilder reentrant

serial vs 5 threads output AOD have been checked with custom code: the egamma part (Electrons, Photons, egammaClusters) is invariant.

Closes ATLASRECTS-4604

unmarked as a Work In Progress

changed the description

This merge request affects 1 package:

• Reconstruction/egamma/egammaAlgs

Adding @goetz as watcher

added Egamma Reconstruction master review-pending-level-1 labels

changed title from EMBremCollectionBuilder reentrant to ATLASRECTS-4604: EMBremCollectionBuilder reentrant

CI Result SUCCESS (hash 881d73b2)

	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 21544]

changed the description

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

merged

mentioned in commit 3e9db117

added sweep:ignore label