[MRG+1] Sunset 32-bit builds

[aaronreidsmith]

Description

Windows is 1-2% of our user base (source) with 32-bit probably being a small fraction of that. Microsoft stopped offering 32-bit Windows in 2020, so there is no need to continue supporting it. We already stopped building 32-bit for 3.10+ due to dependencies not supporting it, v2.0 seems as good a time as ever to remove it completely. This should also help our build times since it reclaims 3 builds on each commit in GHA.

Type of change

• [X] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [X] CI/CD change

How Has This Been Tested?

N/A

Checklist:

• [X] I have performed a self-review of my own code
• [X] I have commented my code, particularly in hard-to-understand areas
• [X] I have made corresponding changes to the documentation
• [X] My changes generate no new warnings
• [X] I have added tests that prove my fix is effective or that my feature works
• [X] New and existing unit tests pass locally with my changes

[aaronreidsmith]

Had to update the "required checks" to match the new builds, so this will block other PRs for now