Feature flag: look up commits without batch-check

Introduction of the new feature flag cat_file
that switch git object extraction process.
If enabled there won't be call to 'git cat-file --batch-check'
before 'git cat-file --batch' to extract the object.

Part of https://gitlab.com/gitlab-org/gitaly/issues/2255

lib/feature/gitaly.rb

@@ -11,6 +11,7 @@ class Feature
         inforef_uploadpack_cache
         get_tag_messages_go
         filter_shas_with_signatures_go
+        commit_without_batch_check
       ].freeze
 
     DEFAULT_ON_FLAGS = Set.new([]).freeze

spec/requests/api/internal/base_spec.rb

@@ -326,7 +326,7 @@ describe API::Internal::Base do
           expect(json_response["gitaly"]["repository"]["relative_path"]).to eq(project.repository.gitaly_repository.relative_path)
           expect(json_response["gitaly"]["address"]).to eq(Gitlab::GitalyClient.address(project.repository_storage))
           expect(json_response["gitaly"]["token"]).to eq(Gitlab::GitalyClient.token(project.repository_storage))
-          expect(json_response["gitaly"]["features"]).to eq('gitaly-feature-inforef-uploadpack-cache' => 'true', 'gitaly-feature-get-tag-messages-go' => 'true', 'gitaly-feature-filter-shas-with-signatures-go' => 'true', 'gitaly-feature-cache-invalidator' => 'true')
+          expect(json_response["gitaly"]["features"]).to eq('gitaly-feature-inforef-uploadpack-cache' => 'true', 'gitaly-feature-get-tag-messages-go' => 'true', 'gitaly-feature-filter-shas-with-signatures-go' => 'true', 'gitaly-feature-cache-invalidator' => 'true', 'gitaly-feature-commit-without-batch-check' => 'true')
           expect(user.reload.last_activity_on).to eql(Date.today)
         end
       end
@@ -346,7 +346,7 @@ describe API::Internal::Base do
             expect(json_response["gitaly"]["repository"]["relative_path"]).to eq(project.repository.gitaly_repository.relative_path)
             expect(json_response["gitaly"]["address"]).to eq(Gitlab::GitalyClient.address(project.repository_storage))
             expect(json_response["gitaly"]["token"]).to eq(Gitlab::GitalyClient.token(project.repository_storage))
-            expect(json_response["gitaly"]["features"]).to eq('gitaly-feature-inforef-uploadpack-cache' => 'true', 'gitaly-feature-get-tag-messages-go' => 'true', 'gitaly-feature-filter-shas-with-signatures-go' => 'true', 'gitaly-feature-cache-invalidator' => 'true')
+            expect(json_response["gitaly"]["features"]).to eq('gitaly-feature-inforef-uploadpack-cache' => 'true', 'gitaly-feature-get-tag-messages-go' => 'true', 'gitaly-feature-filter-shas-with-signatures-go' => 'true', 'gitaly-feature-cache-invalidator' => 'true', 'gitaly-feature-commit-without-batch-check' => 'true')
             expect(user.reload.last_activity_on).to be_nil
           end
         end
@@ -594,7 +594,7 @@ describe API::Internal::Base do
           expect(json_response["gitaly"]["repository"]["relative_path"]).to eq(project.repository.gitaly_repository.relative_path)
           expect(json_response["gitaly"]["address"]).to eq(Gitlab::GitalyClient.address(project.repository_storage))
           expect(json_response["gitaly"]["token"]).to eq(Gitlab::GitalyClient.token(project.repository_storage))
-          expect(json_response["gitaly"]["features"]).to eq('gitaly-feature-inforef-uploadpack-cache' => 'true', 'gitaly-feature-get-tag-messages-go' => 'true', 'gitaly-feature-filter-shas-with-signatures-go' => 'true', 'gitaly-feature-cache-invalidator' => 'true')
+          expect(json_response["gitaly"]["features"]).to eq('gitaly-feature-inforef-uploadpack-cache' => 'true', 'gitaly-feature-get-tag-messages-go' => 'true', 'gitaly-feature-filter-shas-with-signatures-go' => 'true', 'gitaly-feature-cache-invalidator' => 'true', 'gitaly-feature-commit-without-batch-check' => 'true')
         end
       end