Use system-wide chromium for webui tests

Fixes: https://pagure.io/freeipa/issue/9347

Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Francisco Trivino <ftrivino@redhat.com>

install/ui/Gruntfile.js

@@ -6,6 +6,7 @@ module.exports = function(grunt) {
         qunit: {
             options: {
                 puppeteer: {
+		    executablePath: '/usr/bin/chromium-browser',
                     args: [
                         "--allow-file-access-from-files"
                     ]

ipatests/azure/templates/prepare-webui-fedora.yml

@@ -1,5 +1,5 @@
 steps:
 - script: |
     set -e
-    sudo dnf -y install npm fontconfig gtk3 atk at-spi2-atk
+    sudo dnf -y install npm fontconfig gtk3 atk at-spi2-atk chromium
   displayName: Install WebUI Unit tests prerequisites