TrigT2CaloCommon: fix memory leak in TrigCaloDataAccessSvc

TrigT2CaloCommon: fix memory leak in TrigCaloDataAccessSvc

Hello,

This MR fixes a memory leak in TrigCaloDataAccessSvc found by valgrind (ATR-30983).
In `lateInit`, there are about 250 cells created with `new`, but memory is not released in `finalize` prior to the deletion of `cache->fullcont`.
In this MR, a vector is added to keep track of the position of these cells in the container, such that we can free memory in `finalize`.
Valgrind confirms this fixes the memory leak. Note that there is no leak in the event loop.

Cheers,
Bertrand