Alleviate the need to map /upload/* URLs to the XWiki Action Servlet when using short URLs with Tuckey UrlRewriteFilter

When using short URLs using Tuckey's UrlRewriteFilter, the upload action does not work properly, as reported in XWIKI-19444. A workaround consists in mapping explicitely /upload/* URLs to the XWiki Action Servlet by adding the configuration below to web.xml. This workaround (or other ones listed in XWIKI-19444 but which have downsides) is needed due to a change in the way Tomcat 9 handles requests compared to Tomcat 8, as described in this comment by vmassol. This issue is about alleviating the need of this workaround.

<servlet-mapping>
  <servlet-name>action</servlet-name>
  <url-pattern>/upload/*</url-pattern>
</servlet-mapping>