Update cmake files for the HepMC3 nightlies

Update cmake files for the HepMC3 nightlies

This merge request affects 2 packages:

• Generators/GeneratorFilters
• Generators/TruthRivetTools

Affected files list will not be printed in this case

added Generators master review-pending-level-1 labels

CI Result SUCCESS (hash 0f74784b)

	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 24662]

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

merged

mentioned in commit 8b852f6a

added sweep:ignore label