Re: [whatwg/streams] Fix coverage script for reference implementation (#1135)

I managed to get c8 working! 😁

Turns out that Node's `vm.Script` (which jsdom uses for `eval()`) is quite finicky about source maps, so I need to massage it a bit by adding a `// #sourceURL` comment. That URL also has to point to an *actual file*, so I'm now running Browserify separately as part of `pretest` and have it write to `bundle.js`. (I wanted to make it write to `generated/bundle.js`, but then the file names in the coverage report are wrong... 🙄)

If it's too farfetched, I can revert back to Istanbul if you want. But I thought this approach would be nicer, since it doesn't negatively affect test runs without coverage. 🙂

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