GeoModelUtilities: Add a size hint to geoGetVolumes.

Add an additional optional argument to geoGetVolumes as a hint on the number of volumes to be returned. If the caller already knows this, then this can allow avoiding some vector resizes.

This merge request affects 1 package:

• DetectorDescription/GeoModel/GeoModelUtilities

This merge request affects 2 files:

• DetectorDescription/GeoModel/GeoModelUtilities/GeoModelUtilities/GeoVisitVolumes.h
• DetectorDescription/GeoModel/GeoModelUtilities/src/GeoVisitVolumes.cxx

Adding @apsallid ,@rbianchi ,@jojungge as watchers

added Geometry main review-pending-level-1 labels

CI Result SUCCESS (hash 12d44c86)

	Athena	AthSimulation	AthGeneration
externals
cmake
make
tests

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Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 6824] (remote access info)

Changes are straight forward and CI succeeds, approving for L1.

removed review-pending-level-1 label

added review-approved label

merged

mentioned in commit e2608f01