Address Techincal Debt Surrounding nav_tabs in the ProjectsHelper

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The following discussion from gitlab-ce!24540 should be addressed:

• @dosuken123 started a discussion: (+3 comments)

  Isn't this essentially same with

  diff --git a/app/helpers/projects_helper.rb b/app/helpers/projects_helper.rb
  index 2a24aa2a382..535ee00547c 100644
  --- a/app/helpers/projects_helper.rb
  +++ b/app/helpers/projects_helper.rb
  @@ -296,7 +296,11 @@ module ProjectsHelper
       nav_tabs = [:home]
   
       if !project.empty_repo? && can?(current_user, :download_code, project)
  -      nav_tabs << [:files, :commits, :network, :graphs, :forks, :releases]
  +      nav_tabs << [:files, :commits, :network, :graphs, :forks]
  +    end
  +
  +    if !project.empty_repo? && can?(current_user, :read_release, project)
  +      nav_tabs << :releases
       end
   
       if project.repo_exists? && can?(current_user, :read_merge_request, project)

  ?

  What's the purpose of get_project_nav_tab_abilities method?