TRT RDO Reduction 2 (change p2 to p3)

Merged Andrew Beddall requested to merge beddall/athena:trt-rdo-reduction3 into master

Version p3 of TRT T-P converters and algorithms for reducing TRT RDO size on disk (by 20% at all mu).
This now activates the p3 version. There is no change to the ESD.
See the epic ticket ATLASSIM-3885
and the TRT ticket ATLASSIM-3887

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