XWIKI-19913: PDF export sometimes fails when setting the cookies for the headless Chrome browser

* Cookies can be duplicated. The code shouldn't break when it happens. Also, it's good to log all cookies, even duplicated ones.

xwiki-platform-core/xwiki-platform-export/xwiki-platform-export-pdf/xwiki-platform-export-pdf-default/src/main/java/org/xwiki/export/pdf/internal/chrome/ChromeManager.java

@@ -307,8 +307,8 @@ public CookieParam toCookieParam(Cookie servletCookie)
      */
     public void setCookies(ChromeDevToolsService tabDevToolsService, List<CookieParam> cookies)
     {
-        this.logger.debug("Setting cookies [{}].",
-            cookies.stream().collect(Collectors.toMap(CookieParam::getName, CookieParam::getValue)));
+        this.logger.debug("Setting cookies [{}].", cookies.stream()
+            .map(cookie -> String.format("%s: %s", cookie.getName(), cookie.getValue())).collect(Collectors.toList()));
         Network network = tabDevToolsService.getNetwork();
         network.enable();
         network.clearBrowserCookies();