Remove intermediate methods on Branch and Tag classes

lib/gitlab/git/branch.rb

 module Gitlab
   module Git
     class Branch < Ref
-      class << self
-        def find(repo, branch_name)
-          if branch_name.is_a?(Gitlab::Git::Branch)
-            branch_name
-          else
-            repo.find_branch(branch_name)
-          end
-        end
-
-        def names_contains_sha(repo, sha, limit: 0)
-          GitalyClient::RefService.new(repo).branch_names_contains_sha(sha)
+      def self.find(repo, branch_name)
+        if branch_name.is_a?(Gitlab::Git::Branch)
+          branch_name
+        else
+          repo.find_branch(branch_name)
         end
       end

lib/gitlab/git/repository.rb

@@ -1358,7 +1358,7 @@ module Gitlab
       def branch_names_contains_sha(sha)
         gitaly_migrate(:branch_names_contains_sha) do |is_enabled|
           if is_enabled
-            Gitlab::Git::Branch.names_contains_sha(self, sha)
+            gitaly_ref_client.branch_names_contains_sha(sha)
           else
             refs_contains_sha(:branch, sha)
           end
@@ -1368,7 +1368,7 @@ module Gitlab
       def tag_names_contains_sha(sha)
         gitaly_migrate(:tag_names_contains_sha) do |is_enabled|
           if is_enabled
-            Gitlab::Git::Tag.names_contains_sha(self, sha)
+            gitaly_ref_client.tag_names_contains_sha(sha)
           else
             refs_contains_sha(:tag, sha)
           end

lib/gitlab/git/tag.rb

 module Gitlab
   module Git
     class Tag < Ref
-      class << self
-        def names_contains_sha(repo, sha)
-          GitalyClient::RefService.new(repo).branch_names_contains_sha(sha)
-        end
-      end
-
       attr_reader :object_sha
       def initialize(repository, name, target, target_commit, message = nil)

lib/gitlab/gitaly_client/ref_service.rb

@@ -146,7 +146,7 @@ module Gitlab
       end
       # Limit: 0 implies no limit, thus all tag names will be returned
-      def tag_names_containing(sha, limit: 0)
+      def tag_names_contains_sha(sha, limit: 0)
         request = Gitaly::ListTagNamesContainingCommitRequest.new(
           repository: @gitaly_repo,
           commit_id: sha,
@@ -155,10 +155,7 @@ module Gitlab
         stream = GitalyClient.call(@repository.storage, :ref_service, :list_tag_names_containing_commit, request)
-        stream.each_with_object([]) do |response, array|
-          encoded_names = response.tag_names.map { |t| Gitlab::Git.ref_name(t) }
-          array.concat(encoded_names)
-        end
+        consume_ref_contains_sha_response(stream, :tag_names)
       end
       # Limit: 0 implies no limit, thus all tag names will be returned
@@ -171,10 +168,7 @@ module Gitlab
         stream = GitalyClient.call(@repository.storage, :ref_service, :list_branch_names_containing_commit, request)
-        stream.each_with_object([]) do |response, array|
-          encoded_names = response.branch_names.map { |b| Gitlab::Git.ref_name(b) }
-          array.concat(encoded_names)
-        end
+        consume_ref_contains_sha_response(stream, :branch_names)
       end
       private
@@ -247,6 +241,13 @@ module Gitlab
         Gitlab::Git::Commit.decorate(@repository, hash)
       end
+      def consume_ref_contains_sha_response(stream, collection_name)
+        stream.each_with_object([]) do |response, array|
+          encoded_names = response.send(collection_name).map { |b| Gitlab::Git.ref_name(b) } # rubocop:disable GitlabSecurity/PublicSend
+          array.concat(encoded_names)
+        end
+      end
+
       def invalid_ref!(message)
         raise Gitlab::Git::Repository::InvalidRef.new(message)
       end