Add call to action to issue analytics empty state

When a group has 0 issues, the issue analytics empty state at /groups/GROUP_NAME/-/issues_analytics should include a call to action to create a new issue.

• Empty state for when a Group one or more projects but no issues ('select project' dropdown would link to selected project's issues page)
• Empty state for when a Group has no Issues and Projects ('new project' button would link to new project web form)

Here are examples of these empty states on group issue pages (/groups/GROUP_NAME/-/issues):

Scenario	Image
group with no projects
group with projects but 0 issues

(old screenshots)