Migrate 32-bit linux build
Right now our 32-bit build only happens on a Linux VM in azure pipelines. Anaconda no longer builds 32-bit linux packages, and conda-forge never built 32-bit packages. So that build is likely to cause problems over time.

We should migrate to either

1. Use a 32-bit windows build, which Anaconda still builds packages for.
2. Use a non-conda environment on 32-bit linux VM.

1 is probably preferable since it aligns with the rest of our CI infra. I don't know if Azure provides 32-bit images (last I checked the didn't). IIRC, you can trick conda into installing 32-bit packages on a 64-bit machine, but I'm not sure how robust that is.