CORS policy is not applied on resources coming from webjars

Actually XWIKI-11300 strikes again (see screenshot) on xwiki.org.

From what I see, the CORS policy is not applied on the webjar resources (I don't see "Access-Control-Allow-Origin" in the HTTP headers).
It seems it has been caused by XWIKI-10881.

Some errors I see:

https://github.com/xwiki/xwiki-platform/blob/xwiki-platform-7.1/xwiki-platform-core/xwiki-platform-web/src/main/webapp/WEB-INF/web.xml#L228

<filter-mapping>
    <filter-name>Set CORS policy for fonts</filter-name>
    <url-pattern>/bin/webjars/*</url-pattern>
</filter-mapping>

The URL patten has not been updated. It should be /webjars/* (without the /bin part).

Moreover, it seems we should add

<dispatcher>FORWARD</dispatcher>

to this filter, according to
https://github.com/xwiki/xwiki-platform/blob/xwiki-platform-7.1/xwiki-platform-core/xwiki-platform-resource/xwiki-platform-resource-servlet/src/main/java/org/xwiki/resource/servlet/RoutingFilter.java#L150

this.servletContext.getNamedDispatcher("resourceReferenceHandler").forward(request, response);

But tested on xwiki.org, it actually does not solve the issue.

Anyway, setting the CORS policy with a filter at web.xml was a temporary solution. Now that we have XWIKI-10881, we might want to implement a filter with the XWiki components.