Remove L1Topo xmls from source tree

Merged Javier Montejo Berlingen requested to merge jmontejo/athena:l1topoxmls into 21.3

L1Topo xmls are built and installed automatically. When L1Topo changes the ones in the source tree are outdated and can interfere.

Should fix then errors in the nighlty in test_HLT_physics_menu_build: ATR-19663

Edited by Javier Montejo Berlingen

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