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mediabackups: Prepare reshard for backup*012, new host

Jcrespo requested to merge T376800 into main

Redo the sharding algorithm, so it changes minimally after adding the extra host on both dcs: backup1012 in eqiad and backup2012 in codfw.

The assignment is changed so that with the extra host only hashes starting with f get moved to the new host, keeping the other assignments the same.

Bug: T376892

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