Change autodevops banner from warning to info

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/views/shared/_auto_devops_implicitly_enabled_banner.html.haml

 - if show_auto_devops_implicitly_enabled_banner?(project, current_user)
-  .qa-auto-devops-banner.auto-devops-implicitly-enabled-banner.alert.alert-warning
+  .qa-auto-devops-banner.auto-devops-implicitly-enabled-banner.alert.alert-info
     - more_information_link = link_to _('More information'), help_page_path('topics/autodevops/index.md'), target: '_blank', class: 'alert-link'
     - auto_devops_message = s_("AutoDevOps|The Auto DevOps pipeline has been enabled and will be used if no alternative CI configuration file is found. %{more_information_link}") % { more_information_link: more_information_link }
     = auto_devops_message.html_safe