AthenaConfiguration: Enable SharedWriter in AthenaMP by default

Merged Alaettin Serhan Mete requested to merge amete/athena:23.0-MP-SW-default into 23.0

This is a side-product of the discussion in ATEAM-910. With this change, we're enabling SharedWriter by default in AthenaMP such that worker outputs will be merged on-the-fly (a la Derivation jobs) and we won't have to run file merging.

cc: @tsulaia @gemmeren @elmsheus

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