Don't fetch any tags from a forked repo

Closes #13957

CHANGELOG

 Please view this file on the master branch, on stable branches it's out of date.
 
 v 8.7.0 (unreleased)
+  - Don't attempt to fetch any tags from a forked repo (Stan Hu)
   - Don't attempt to look up an avatar in repo if repo directory does not exist (Stan hu)
   - Preserve time notes/comments have been updated at when moving issue
   - Make HTTP(s) label consistent on clone bar (Stan Hu)

app/models/repository.rb

@@ -820,7 +820,7 @@ class Repository
   end
 
   def fetch_ref(source_path, source_ref, target_ref)
-    args = %W(#{Gitlab.config.git.bin_path} fetch -f #{source_path} #{source_ref}:#{target_ref})
+    args = %W(#{Gitlab.config.git.bin_path} fetch --no-tags -f #{source_path} #{source_ref}:#{target_ref})
     Gitlab::Popen.popen(args, path_to_repo)
   end