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Improving hashing for BIL

Paul Nathaniel Swallow requested to merge pswallow/athena:ps-BILHashing into main

When incorporating new BIL RPC chambers into the ATLAS geometry, an error occurred due to incorrect hashing of inner RPC chambers in Sector 9 that had doublet Phi values of 1 and 2. RpcIdHelper required the zIndex to differ between these two doublet Phi values to give unique hashes to each detector element.

This was previously started on a different MR, but that branch had local build issues so I rebuilt this as a clean branch, closed the old MR, and used the comments from the previous MR: !70450 (closed)

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