Merge branch '18924-gitlab-ce-tags-page-is-not-working-502-read-timeout' into 'master'

Use memorized tags array when searching tags by name

See merge request !4859

CHANGELOG

@@ -9,6 +9,7 @@ v 8.10.0 (unreleased)
 
 v 8.9.1
   - Fix GitLab project import issues related to notes and builds
+  - Improve performance of searching repository tags by name by using a memorized tag array
   - Fix 404 when accessing pipelines as guest user on public projects
 
 v 8.9.0

app/models/repository.rb

@@ -130,7 +130,7 @@ class Repository
   end
 
   def find_tag(name)
-    raw_repository.tags.find { |tag| tag.name == name }
+    tags.find { |tag| tag.name == name }
   end
 
   def add_branch(user, branch_name, target)