TrkVertexTools: Use Accessor, etc instead of auxdata().

Replace auxdata, etc. with Accessor classes. Moving to deprecate these usages in the Athena build.

This merge request affects 1 package:

• Tracking/TrkVertexFitter/TrkVertexTools

This merge request affects 1 file:

• Tracking/TrkVertexFitter/TrkVertexTools/src/SecVertexMergingTool.cxx

added Tracking main review-pending-level-1 labels

CI Result SUCCESS (hash 55f89461)

	Athena
externals
cmake
make
tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 9932] (remote access info)

MR looks fine from L1 perspective, CI shows no problems - approving

Cheers, Qiyu, L1

removed review-pending-level-1 label

added review-approved label

merged

mentioned in commit d1366718