Use Git cached counters on project show page

Besides when building the repository cache we cache 
those git counters too

CHANGELOG

@@ -110,6 +110,7 @@ v 8.9.0 (unreleased)
   - Various associations are now eager loaded when parsing issue references to reduce the number of queries executed
   - Set inverse_of for Project/Service association to reduce the number of queries
   - Update tanuki logo highlight/loading colors
+  - Use Git cached counters for branches and tags on project page
 
 v 8.8.5
   - Import GitHub repositories respecting the API rate limit !4166

app/models/repository.rb

@@ -243,7 +243,7 @@ class Repository
   end
 
   def cache_keys
-    %i(size branch_names tag_names commit_count
+    %i(size branch_names tag_names branch_count tag_count commit_count
        readme version contribution_guide changelog
        license_blob license_key gitignore)
   end

app/views/projects/show.html.haml

@@ -23,10 +23,10 @@
           #{'Commit'.pluralize(@project.commit_count)} (#{number_with_delimiter(@project.commit_count)})
       %li
         = link_to namespace_project_branches_path(@project.namespace, @project) do
-          #{'Branch'.pluralize(@repository.branch_names.count)} (#{number_with_delimiter(@repository.branch_names.count)})
+          #{'Branch'.pluralize(@repository.branch_count)} (#{number_with_delimiter(@repository.branch_count)})
       %li
         = link_to namespace_project_tags_path(@project.namespace, @project) do
-          #{'Tag'.pluralize(@repository.tag_names.count)} (#{number_with_delimiter(@repository.tag_names.count)})
+          #{'Tag'.pluralize(@repository.tag_count)} (#{number_with_delimiter(@repository.tag_count)})
 
       - if default_project_view != 'readme' && @repository.readme
         %li