Bug: AMVF `deleteLastVertex` might be wrong

[andiwand]

https://github.com/acts-project/acts/blob/main/Core/include/Acts/Vertexing/AdaptiveMultiVertexFinder.ipp#L549

I noticed that deleteLastVertex might be bugged.

• we destroy the vertex candidate and access it again
• we refit with the vertex we actually want to delete

I tried fixing it here https://github.com/andiwand/acts/tree/try-fix-amvf-delete-last-vertex

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[github-actions]

This issue/PR has been automatically marked as stale because it has not had recent activity. The stale label will be removed if any interaction occurs.