[BUG] npm-template-check should tell us if templated files have the wrong content

[nlf]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

if a templated file is manually edited, npm-template-check won't notice (except for the package.json and .gitignore)

Expected Behavior

we should receive an error and the check should fail if other templated files (i.e. ci workflows, eslint config, etc) do not match what they should

Steps To Reproduce

1. mkdir foo && cd foo && npm init -y
2. npm i -D @npmcli/template-oss
3. echo "" >> .github/actions/ci.yml
4. npm run lint
5. observe there is no error, despite the ci.yml having a change from the template

Environment

• npm: 8.4.0
• Node: 16.13.2
• OS: osx
• platform: M1 Macbook Pro