[Bug]: @bazel/runfiles does not work with non-bzlmod when a _repo_mapping file exists

### What happened?

When bzlmod is disabled it seems bazel7 still creates a `.repo_mapping` file which is configured different then when bzlmod is enabled.

### Version

rules_nodejs with https://github.com/bazel-contrib/rules_nodejs/commit/21b56da9f20c9c5e8b8c1ac19052f1f7cc7b5920 and bazel7 with `--enable_bzlmod=false`

### How to reproduce

```shell
Run the rules_js `e2e/runfiles` test with bazel7 and non-bzlmod: https://github.com/aspect-build/rules_js/commit/0cf77d9562d59c7a4e59269ba888ad21d4f99ce7
```

### Any other information?

_No response_