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3d6d97a0 - Increase max total number of dynamo partitions to 15 (#134153)

Increase max total number of dynamo partitions to 15 (#134153) Summary: Needed to be able to split some of the aarch64 workflows to 15 shards X-link: https://github.com/pytorch/pytorch/pull/134153 Approved by: https://github.com/seemethere, https://github.com/kit1980, https://github.com/ZainRizvi Reviewed By: jeanschmidt Differential Revision: D61670458 Pulled By: malfet fbshipit-source-id: 31361b7f3ad03828019d171936996502d87d71a6