trace-deps: Handle pnpm style of hard/soft links.

`trace-deps` can't handle seemingly simple pnpm deps because presumably the mix of hard and soft links.

## WIP Branch

https://github.com/FormidableLabs/tracing/compare/main...bug/pnpm

## Example

For example, a package `@remix-run/node` with prod dep `abort-controller` ends up with a trace error of:

```
ERROR Error: Encountered resolution error in /PATH/TO/project/node_modules/@remix-run/node/dist/index.js for abort-controller: Error: Cannot find module 'abort-controller' from '/PATH/TO/project/node_modules/@remix-run/node/dist'
```

where the real module is at:

```
node_modules/.pnpm/@remix-run+node@1.7.1_biqbaboplfbrettd7655fr4n2y/
```

although on disk we have these symlinks:

```
node_modules/.pnpm/node_modules/abort-controller
node_modules/.pnpm/@remix-run+node@1.7.1_biqbaboplfbrettd7655fr4n2y/node_modules/abort-controller
```

that point to:

```
node_modules/.pnpm/abort-controller@3.0.0/node_modules/abort-controller
```

which exists and has the necessary files.

## Tasks

- [ ] Come up with failing unit test using analogous symlinks and such
- [ ] Fix the issue.