Decrease ProjectsHelper#get_project_nav_tabs cyclomatic complexity

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The following discussion from gitlab-ce!23687 should be addressed:

• @reprazent started a discussion: (+3 comments)

  Should the Feature.enabled? be part of the ProjectsHelper#get_project_nav_tabs?

ProjectsHelper#get_project_nav_tabs is already at Cyclomatic Complexity limit.

Adding an if there will cause a failure on rubocop.