Add LB mu writer to decorate EventInfo in JetRecTestCfg

JetCalibTool now requires the EventInfo decorations, so it's necessary to add the LB mu writer at least to run on Run 2 AODs.

Might need some better testing to be future-proof, but this still seems to be under development.

@jbossios, be aware that it's now a bit of a pain to test JetCalibrationTool in master on older samples.

@chala, this seems to get the script running again.

This merge request affects 1 package:

• Reconstruction/Jet/JetRecConfig

Adding @goetz as watcher

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

CI Result SUCCESS (hash 4e367e44)

	Athena	AthSimulation	AnalysisBase	AthGeneration
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
AnalysisBase: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 14072]

Looks good, approving --L1

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

merged

mentioned in commit 49c7a472

added sweep:ignore label