Support aarch64 and aarch64 conda builds

[agm-eratosth]

There are no aarch64 builds in https://anaconda.org/pytorch/pytorch. There should be aarch64 and aarch64 + CUDA builds within the pytorch conda channel. There are wheel files now available (see below). Could we get the build process to include builds for conda?

Related tickets #126174 #1856 , N8-CIR-Bede/documentation#199 and #123835 (and likely others).

The following wheel file is available which has cuda support (note that it seems this is only true for CUDA 12.4 version 2.4.0 of pytorch):

https://download.pytorch.org/whl/cu124/torch-2.4.0-cp311-cp311-linux_aarch64.whl

Comparing with the below conda channel, there is no corresponding aarch64 or aarch64 with CUDA build in conda:

https://anaconda.org/pytorch/pytorch/files?version=2.4.0

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