Refactor junit_html_report

[Writhe]

Currently, junit_html_report depends on React and a 3rd party UI kit just to display a collapsible list. It works, but...

• React might be a bit of an overkill in this case,
• the format of data and the way it's injected in the resulting HTML can be simplified; Right now the shape of data is dictated by the UI kit that consumes it.

My proposition:

• replace Create React App with either plain JS (or TS) bundled and minified by Webpack
• replace html inliner with additional step in Webpack build process
• reshape data into a simple nested structure
• move data to a separate <script> tag