Run all workspace tests in CI (MacOS)

[drinkcat]

Similar to #7392, it would be nice to run all tests in CI, on MacOS (basically adding workspace-tests: true to both macos jobs in the matrix).

When I tried in #7386, I hit this issue:

error: couldn't read /Users/runner/work/coreutils/coreutils/target/aarch64-apple-darwin/debug/build/fts-sys-bdca82aeb17ec986/out/fts-sys.rs: No such file or directory (os error 2)
  --> /Users/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/fts-sys-0.2.14/src/lib.rs:24:1
   |
24 | include!(concat!(env!("OUT_DIR"), "/fts-sys.rs"));
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: this error originates in the macro `include` (in Nightly builds, run with -Z macro-backtrace for more info)

error: could not compile `fts-sys` (lib) due to 1 previous error
warning: build failed, waiting for other jobs to finish...
Error: Process completed with exit code 101.

It's a bit unfortunate that fts-sys gets pulled. I think it's only required by chcon (selinux), which makes no sense on MacOS. But I'm not sure if there's a way around this.

I think the easiest will be to patch fts-sys to generate an empty crate on non-supported platforms: https://codeberg.org/koutheir/fts-sys/issues/3

There might be more issues after that one gets fixed.