feat: copy missing or new test templates

[steinybot]

This PR contains a:

• [ ] bugfix
• [x] new feature
• [ ] code refactor
• [ ] test update
• [ ] typo fix
• [ ] metadata update

Motivation / Use-Case

While fixing #190 I realised that rerunning npm run defaults would not re-copy the test templates. Perhaps that is why there were so many templates missing.

Breaking Changes

Previously test files would only be copied once even if the module was upgraded and new templates were added. This means that people who had previously deleted unwanted test file files may have them reappear (although most have been replaced since 6.0.0 anyway).

Additional Info

[rgant]

Very Helpful. Thank you!