TrkMaterialProvider: fix memory leak in TrkMaterialProviderTool

Bertrand Martin Dit Latourrequested to merge
martindl/athena:24.0_TrkMatLeak into 24.0

Hello,

This MR is fixing a memory leak in TrkMaterialProviderTool found by valgrind (ATR-30983). Memory was allocated in initialize() but never released. Moved to unique_ptr.

Cheers, Bertrand

Edited by Bertrand Martin Dit Latour

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