[Android] Remove 32-bit x86 support

Summary:
Context: https://linear.app/comm/issue/ENG-4349/github-ci-for-android-appears-to-have-a-disk-space-issue

There are exceptionally few 32-bit x86 devices. By removing support for this architecture we can reduce disk usage and "fix" the GH Actions Android workflow. (There aren't a ton of 64-bit x86 devices either, but it's important to support that architecture for those using Android Emulator on Intel dev machines)

Depends on D8688

Test Plan: Android build succeeded on fork: https://github.com/atulsmadhugiri/comm/actions/runs/5719889594/job/15498728183

Reviewers: ashoat, ginsu, jon, marcin, tomek

Reviewed By: ashoat

Differential Revision: https://phab.comm.dev/D8689