c8 version 7.x does not support v8 coverage from playwright

[Aghassi]

rules_js/js/private/coverage/bundle/package.json

Line 4 in cb6beb2

"c8": "7.13.0"

This version does not poses the ability to convert Chrome v8 coverage (generated off a webpack bundle) to a proper lcov format. I had to instead write my own coverage reporter patch (see #1806 ) and then use https://github.com/cenfun/monocart-coverage-reports/tree/main to generate the report. The newest version of c8 (10.x) uses monocart under the hood and should theoretically fix this issue if rules_js adopts it