gen_rust_project doesn't respect --symlink_prefix=.bazel/

Hey, I'm not sure if this is the issue, but I think it is.

Basically I run:
`bazel run @rules_rust//tools/rust_analyzer:gen_rust_project -- "//..."`

And it mostly works fine, but for one of my projects, I dynamically generate a Cargo.toml since uniffi proc-macro requires it. However, it's erroring with:

```
• failed to open file bazel-out/darwin_arm64-fastbuild/bin/rust-code/example-shared-lib/example/Cargo.toml macro-error
```

And I realise that the folder it should be in is `.bazel/out/darwin_arm64-fastbuild/bin/rust-code/example-shared-lib/example/Cargo.toml` which does exist, this is due to the configuration in my .bazelrc: `build --symlink_prefix=.bazel/`