Improve the slow loading of the required modules by using the new webjar URL

Right now, for XWiki < 7.1M1, we are using a workaround for working with RequireJs and Webjar URLs.

However, this workaround is very costly in terms of performance since it uses the view action to load an entire page and then to redirect. This is done for each required resource (~20).

With XWIKI-11996 and with using the RequireJs-compatible webjar URL format, this performance penalty should be removed.

There would probably still be a performance penalty since we are not doing any kind of optimization to our modules. A separate solution should be found for this, depending on how great of an impact on performance remains.