Remove L1 v8 xmls

Javier Montejo Berlingenrequested to merge
jmontejo/athena:21.3_xmls into 21.3

Test MR, we are fighting with conflicts in the xmls and it seems nobody uses them directly from the source tree

Includes changes from !22125 (merged) as it fixes a crash on the CI

Edited by Javier Montejo Berlingen

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