Hide "New issue" button on project "Issues" page from auditor

Summary

New issue button on issues page should not be shown to auditors as they have read-only permissions.

Steps to reproduce

1. Create a project
2. Log-in as an Auditor
3. Navigate to "Project" -> "Issues"

What is the current bug behavior?

Button is shown to Auditors but returns a 404 if clicked

What is the expected correct behavior?

Button should not be shown to Auditors

Relevant logs and/or screenshots

Possible fixes

• Add show_new_issue_link?(@project) check to app/views/shared/empty_states/_issues.html.haml#L44