GeoMaterial2G4+Geo2G4: Add missing const qualifiers.

Treat return from GetMaterialPropertiesTable() as const. Needed to go with upcoming thread-safety fixes in GeoModelUtilities.

This merge request affects 2 packages:

• Simulation/G4Utilities/Geo2G4
• Simulation/G4Utilities/GeoMaterial2G4

Adding @jchapman ,@vpascuzz as watchers

added Simulation master review-pending-level-1 labels

CI Result FAILURE (hash c234ecae)

	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 20403]

Jenkins please retry a build

This merge request affects 2 packages:

• Simulation/G4Utilities/Geo2G4
• Simulation/G4Utilities/GeoMaterial2G4

Adding @jchapman ,@vpascuzz as watchers

CI Result SUCCESS (hash c234ecae)

	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 20453]

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

merged

mentioned in commit b479b6b0

added sweep:ignore label