`embark-act` doesn't use project root directory with `projectile-find-file`

### What did you expect to happen?

`embark-act` should work from `projectile-find-file` throughout a project.

### What actually happened?

Commands (such as `find-file-other-window` and `consult-file-externally`) fail when `projectile-find-file` is called from a file not at the project root. For example, `find-file-other-window` tries to create the missing directories and file from within the current file's directory. It looks like a similar problem to #5494.

### Describe your attempts to resolve the issue

I haven't put more time into debugging it yet.

### Steps to reproduce

1. Open Emacs
2. Open a project (using projectile)
3. Open a file not at the project root
3. Run `projectile-find-file`
4. Run `embark-act`
5. Select `find-file-other-window` or `consult-file-externally`
6. It will try to create the file or fail silently

### System Information

https://pastebin.com/99fzB3rD