Fix repository cache invalidation issue when project is recreated with an empty repo

To reproduce:

1. Create a project with some content
2. Rename the project
3. Create a new project with the same name.
4. Boom - 404.

After step 2, the branch and tag counts were not being cleared. This would
cause `repository.has_visible_content?` to erroneously return `true`
for the newly-created project.

Closes #13384

CHANGELOG

@@ -43,6 +43,7 @@ v 8.7.0 (unreleased)
   - Update number of Todos in the sidebar when it's marked as "Done". !3600
   - API: Expose 'updated_at' for issue, snippet, and merge request notes (Robert Schilling)
   - API: User can leave a project through the API when not master or owner. !3613
+  - Fix repository cache invalidation issue when project is recreated with an empty repo (Stan Hu)
 
 v 8.6.6
   - Fix error on language detection when repository has no HEAD (e.g., master branch). !3654 (Jeroen Bobbeldijk)

app/models/repository.rb

@@ -253,6 +253,8 @@ class Repository
     # This ensures this particular cache is flushed after the first commit to a
     # new repository.
     expire_emptiness_caches if empty?
+    expire_branch_count_cache
+    expire_tag_count_cache
   end
 
   def expire_branch_cache(branch_name = nil)

spec/models/repository_spec.rb

@@ -393,6 +393,8 @@ describe Repository, models: true do
   describe '#expire_cache' do
     it 'expires all caches' do
       expect(repository).to receive(:expire_branch_cache)
+      expect(repository).to receive(:expire_branch_count_cache)
+      expect(repository).to receive(:expire_tag_count_cache)
 
       repository.expire_cache
     end