Disable auto-allocate-uids on Linux too

[Hoverbear]

Description

We're currently trying to route around #539. We saw a number of issues on Mac and we are now seeing some similar issues on certain Linux distributions. We're looking to roll this feature back until we can either develop a better heuristic or it's resolved upstream.

Checklist

• Formatted with cargo fmt
• Built with nix build
• Ran flake checks with nix flake check
• Added or updated relevant tests (leave unchecked if not applicable)
• Added or updated relevant documentation (leave unchecked if not applicable)
• Linked to related issues (leave unchecked if not applicable)

Validating with install.determinate.systems

If a maintainer has added the upload to s3 label to this PR, it will become available for installation via install.determinate.systems:

curl --proto '=https' --tlsv1.2 -sSf -L https://install.determinate.systems/nix/pr/$PR_NUMBER | sh -s -- install

[cole-h]

LGTM, but rustfmt/clippy doesn't agree