.coveragerc files become duplicates instead of being symlinks

[ejfine]

Is there an existing issue for this?

• I have searched the existing issues

What you expected to see, versus what you actually saw

The two .coveragerc files in the downstream template end up being separate files, which can be edited separately accidentally.

Potential solution would be to create a copier task that creates a symlink, since these really should be symlinked in the downstream repo. I think there's some option in copier to "preserve symlinks", but I'm not sure if that's a global setting for all symlinks in the template, and whether we'd want to do that, or just create tasks to symlink on a one-off as-needed basis

cc @zendern

[ejfine]

...or we could just have a task that moves it. there's no reason we need to have the file at the repo root in this template...that was just where the copier-base put it