fix(setupWorker): prevent the `mockServiceWorker.js` script to be picked up by v8 coverage (e.g. Vitest)

[astorije]

This ensures that projects setting up msw do not accidentally drop their coverage metrics for the auto-generated script.

This can of course be configured at consumer level but I figured it makes more sense to do so in the script itself like it is currently done for ESLint and TSLint.

References:

• https://vitest.dev/guide/coverage#ignoring-code
• https://github.com/istanbuljs/v8-to-istanbul?tab=readme-ov-file#ignoring-all-lines-until-told

Let me know what you think! :)

[kettanaito]

Hi! Thanks for proposing this. This isn't something that MSW should ship. Instead, you shouldn't run your linting in the /public directory, to begin with. Please configure your tools to ignore that directory.

This has been suggested multiple times in different shapes (adding eslint-ignore, etc), and I think it's about time I added a proper decision document I can link so it's easier to explain why this shouldn't be a part of the library. I will write that document whenever I have a minute.

Thanks for understanding!