MagFieldField Elements,use CxxUtils::vec notation also in the getCache

This is follow up to

!36115 (merged) !35966 (merged) !36161 (merged)

Try to use SIMD vector notation on the getCache

Mentioning @schaffer

This merge request affects 1 package:

• MagneticField/MagFieldElements

added Magnets master review-pending-level-1 labels

CI Result SUCCESS (hash a8b79151)

	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 20055]

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

merged

mentioned in commit 32e16dc7

added sweep:ignore label